Anticancer agent

ABSTRACT

The problem of the present invention is to provide a useful prodrug compound of a naphthofuran compound. The present invention relates to a compound represented by the formula (IA): 
                         
[wherein each symbol is as described in the DESCRIPTION] or a pharmaceutically acceptable salt thereof.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent application is the U.S. national phase of International Patent Application No. PCT/JP2015/066625, filed on Jun. 9, 2015, which claims the benefit of Japanese Patent Application No. 2015-021492, filed on Feb. 5, 2015, and Japanese Patent Application No. 2014-119113, filed Jun. 9, 2014, the disclosures of which are incorporated herein by reference in their entireties for all purposes.

TECHNICAL FIELD

The present invention relates to a prodrug of a naphthofuran compound or a pharmaceutically acceptable salt thereof. Also, the present invention relates to a pharmaceutical composition containing the above-mentioned prodrug or a pharmaceutically acceptable salt thereof. Furthermore, the present invention relates to an anticancer agent containing the above-mentioned prodrug or a pharmaceutically acceptable salt thereof, and an agent for the prophylaxis or treatment of cancer metastasis and/or cancer recurrence.

BACKGROUND ART

A prodrug is a compound which scarcely shows expected efficacy by itself but, after administration into the body, is converted to a drug as an active compound by undergoing metabolism by hydrolysis, oxidation, reduction, and the like under physiological conditions to show efficacy. It aims at persistence of pharmacological actions, increase in water-solubility, reduction of side effects and toxicity, improvement of stability in vivo, improvement of taste and odor, and improvement of bioavailability by oral administration (particularly, easy absorption from gastrointestinal tract) and the like, as compared to administration of the drug itself as an active compound.

When a prodrug is designed, consideration is necessary to achieve conversion to an active compound by undergoing metabolism by hydrolysis, oxidation, reduction and the like under physiological conditions. As a typical example thereof, a method including modifying a functional group that the active compound itself has such as amino group, hydroxy group, carboxy group and the like with a particular group is known. For example, it is known that a modifying group is removed by hydrolysis and the like under physiological conditions to restore an amino group, a hydroxy group or a carboxy group in a compound wherein an amino group thereof is eicosanoylated, alanylated, pentylaminocarbonylated, (5-methyl-2-oxo-1,3-dioxolen-4-yl)methoxycarbonylated, tetrahydrofuranylated, pyrrolidylmethylated, pivaloyloxymethylated or tert-butylated when the active compound has an amino group; a compound wherein a hydroxy group thereof is acetylated, palmitoylated, propanoylated, pivaloylated, succinylated, fumarylated, alanylated or dimethylaminomethylcarbonylated when the active compound has a hydroxy group; a compound wherein a carboxy group thereof is ethylesterified, phenylesterified, carboxymethylesterified, dimethylaminomethylesterified, pivaloyloxymethylesterified, 1-ethoxycarbonyloxyethylesterified, phthalidylesterified, (5-methyl-2-oxo-1,3-dioxolen-4-yl)methylesterified or 1-cyclohexyloxycarbonyloxyethylesterified when the active compound has a carboxy group, and the like.

A naphthofuran compound represented by the following formula (A) (hereinafter sometimes to be referred to as compound (A)) has an inhibitory action on Stat3, β-catenin, Nanog pathways and the like, particularly induces apoptosis of cancer stem cells, and is a compound expected to effectively suppress cancer recurrence or metastasis (patent documents 1-5, non-patent documents 1-4).

Since compound (A) has low solubility and is unsuitable for injection, it is developed as an oral preparation. However, since it shows low oral absorbability, administration of a high dose is necessary even when pharmaceutical studies of pulverization of bulk powder, use of solubilizing agents and the like are performed, which gives rise to concern about unexpected side effects such as disorder of digestive tract and the like. Therefore, it is desired to achieve improvement of oral absorbability, persistence of pharmacological action, and reduction of side effects and toxicity by converting to a prodrug. Furthermore, since oral administration is often difficult for cancer patients, the development of an injection is also desired. Accordingly, improvement of solubility by converting to a prodrug is desired.

DOCUMENT LIST Patent Documents

-   Patent document 1: JP-A-2013-522326 -   Patent document 2: JP-A-2013-522325 -   Patent document 3: JP-A-2010-539098 -   Patent document 4: JP-A-2010-539097 -   Patent document 5: JP-A-2010-539095

Non-Patent Documents

-   Non-patent document 1: 2014 ASCO Annual Meeting abstracts, No. 2530 -   Non-patent document 2: 2014 ASCO Annual Meeting abstracts, No. 2546 -   Non-patent document 3: 2014 ASCO Annual Meeting abstracts, No.     TPS3660 -   Non-patent document 4: Proc. Natl. Acad. Sci. USA, 2015, 112(6),     pages 1839-1844

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

Since the above-mentioned compound (A) does not have a functional group such as amino group, hydroxy group, carboxy group and the like, a conventional prodrug method by a modifying group cannot be applied. While compound (A) has a structure in which an acetyl group is bonded to aromatic heterocycle, there are only a small number of examples of a prodrug by conversion to an acetyl group and a novel method of converting to a prodrug needs to be developed.

The problem of the present invention is to provide a prodrug compound improved in the solubility, oral absorbability, persistence and side effects such as disorder of gastrointestinal tract and the like of a naphthofuran compound represented by the formula (B) to be mentioned later. Furthermore, it is provision of an anticancer agent superior in solubility, oral absorbability and persistence, and showing less side effects and high safety.

Means of Solving the Problems

The present inventors have conducted intensive studies in an attempt to solve the aforementioned problems and found a novel method for a prodrug, and found that a compound represented by the following formula (IA) or formula (I), or a pharmaceutically acceptable salt thereof, has superior oral absorbability, and further, is easily converted to a naphthofuran compound represented by the formula (B′) or formula (B) to be mentioned later, which shows an extremely superior anticancer action as a medicament in the body, and shows superior persistence, which resulted in the completion of the present invention.

The compound and a pharmaceutically acceptable salt thereof of the present invention have high oral absorbability, are converted, after administration, to a compound having a superior anticancer action on cancer cells and capable of inducing apoptosis of cancer stem cells, and show superior persistence. Therefore, they can be a superior anticancer agent particularly capable of preventing or treating cancer metastasis and/or cancer recurrence.

Accordingly, the present invention relates to

-   [1] a compound represented by the formula (IA):

-   wherein -   R¹ in the number of n are each independently -   a hydrogen atom, -   a halogen atom, -   hydroxy, -   amino, -   cyano, -   nitro, -   C₁₋₁₂ alkyl optionally substituted by substituent(s) selected from     substituent group α, -   C₂₋₆ alkenyl optionally substituted by substituent(s) selected from     substituent group α, -   C₂₋₆ alkynyl optionally substituted by substituent(s) selected from     substituent group α, -   C₃₋₇ cycloalkyl optionally substituted by substituent(s) selected     from substituent group α, -   C₃₋₇ cycloalkenyl optionally substituted by substituent(s) selected     from substituent group α, -   aryl optionally substituted by substituent(s) selected from     substituent group α, -   a heterocyclyl group optionally substituted by substituent(s)     selected from substituent group α, -   C₁₋₆ alkoxy optionally substituted by substituent(s) selected from     substituent group α, -   aryloxy optionally substituted by substituent(s) selected from     substituent group α, -   C₁₋₆ alkylthio optionally substituted by substituent(s) selected     from substituent group α, or -   arylthio optionally substituted by substituent(s) selected from     substituent group α, or -   two R¹ bonded to the adjacent carbon atoms on a benzene ring are     optionally joined to form C₁₋₄ alkylenedioxy optionally substituted     by substituent(s) selected from substituent group α, -   R² is -   C₁₋₁₂ alkyl optionally substituted by substituent(s) selected from     substituent group α, -   C₂₋₆ alkenyl optionally substituted by substituent(s) selected from     substituent group α, -   C₂₋₆ alkynyl optionally substituted by substituent(s) selected from     substituent group α, -   C₃₋₇ cycloalkyl optionally substituted by substituent(s) selected     from substituent group α, -   aryl optionally substituted by substituent(s) selected from     substituent group α, -   aryl C₁₋₆ alkyl optionally substituted by substituent(s) selected     from substituent group α, or -   a heterocyclyl group optionally substituted by substituent(s)     selected from substituent group α, -   R³ is -   a hydrogen atom, -   a halogen atom, -   cyano, -   nitro, -   C₁₋₁₂ alkyl optionally substituted by substituent(s) selected from     substituent group α, -   C₂₋₆ alkenyl optionally substituted by substituent(s) selected from     substituent group α, -   C₂₋₆ alkynyl optionally substituted by substituent(s) selected from     substituent group α, -   C₃₋₇ cycloalkyl optionally substituted by substituent(s) selected     from substituent group α, -   C₃₋₇ cycloalkenyl optionally substituted by substituent(s) selected     from substituent group α, -   aryl optionally substituted by substituent(s) selected from     substituent group α, -   a heterocyclyl group optionally substituted by substituent(s)     selected from substituent group α, -   C₁₋₆ alkoxy optionally substituted by substituent(s) selected from     substituent group α, -   aryloxy optionally substituted by substituent(s) selected from     substituent group α, -   C₁₋₆ alkylthio optionally substituted by substituent(s) selected     from substituent group α, or -   arylthio optionally substituted by substituent(s) selected from     substituent group α, -   n is an integer of 1-4, and -   the substituent group α consists of -   a halogen atom, -   hydroxy, -   optionally substituted amino, -   carboxy, -   C₁₋₆ alkoxycarbonyl, -   a sulfonic acid group (sulfo group), -   a phosphoric acid group, -   a di C₁₋₆ alkyl phosphoric acid group, -   cyano, -   optionally substituted C₁₋₆ alkyl, -   C₃₋₇ cycloalkyl, -   C₃₋₇ cycloalkyl C₁₋₆ alkyl, -   optionally substituted C₁₋₆ alkoxy, -   C₁₋₆ alkylthio, -   optionally substituted aryl, -   optionally substituted aryloxy, -   aryl C₁₋₆ alkoxy, -   an optionally substituted heterocyclyl group, -   optionally substituted C₁₋₆ alkylcarbonyl, -   heterocyclylcarbonyl, -   optionally substituted C₁₋₆ alkylcarbonyloxy, -   optionally substituted C₃₋₇ cycloalkylcarbonyloxy, -   arylcarbonyloxy, -   heterocyclylcarbonyloxy, -   optionally substituted C₁₋₆ alkoxycarbonyloxy, -   optionally substituted heterocyclyl C₁₋₆ alkoxycarbonyloxy, -   C₃₋₇ cycloalkyloxycarbonyloxy, -   heterocyclyloxycarbonyloxy, -   optionally substituted heterocyclyloxy, -   tri C₁₋₆ alkylammonio, -   optionally substituted C₁₋₆ alkylsulfonyl and -   C₁₋₆ alkylsulfamoylcarbonyl, -   or a pharmaceutically acceptable salt thereof; -   [2] a compound represented by the formula (I):

-   wherein -   R¹ is -   a hydrogen atom or a halogen atom, -   R² is -   C₁₋₁₂ alkyl optionally substituted by substituent(s) selected from     substituent group α, -   C₂₋₆ alkenyl optionally substituted by substituent(s) selected from     substituent group α, -   C₂₋₆ alkynyl optionally substituted by substituent(s) selected from     substituent group α, -   C₃₋₇ cycloalkyl optionally substituted by substituent(s) selected     from substituent group α, -   aryl optionally substituted by substituent(s) selected from     substituent group α, -   aryl C₁₋₆ alkyl optionally substituted by substituent(s) selected     from substituent group α, or -   a heterocyclyl group optionally substituted by substituent(s)     selected from substituent group α, -   n is an integer of 1-4, and -   the substituent group α consists of -   a halogen atom, -   hydroxy, -   optionally substituted amino, -   carboxy, -   C₁₋₆ alkoxycarbonyl, -   a sulfonic acid group (sulfo group), -   a phosphoric acid group, -   a di C₁₋₆ alkyl phosphoric acid group, -   cyano, -   optionally substituted C₁₋₆ alkyl, -   C₃₋₇ cycloalkyl, -   C₃₋₇ cycloalkyl C₁₋₆ alkyl, -   optionally substituted C₁₋₆ alkoxy, -   C₁₋₆ alkylthio, -   optionally substituted aryl, -   optionally substituted aryloxy, -   aryl C₁₋₆ alkoxy, -   an optionally substituted heterocyclyl group, -   optionally substituted C₁₋₆ alkylcarbonyl, -   heterocyclylcarbonyl, -   optionally substituted C₁₋₆ alkylcarbonyloxy, -   optionally substituted C₃₋₇ cycloalkylcarbonyloxy, -   arylcarbonyloxy, -   heterocyclylcarbonyloxy, -   optionally substituted C₁₋₆ alkoxycarbonyloxy, -   optionally substituted heterocyclyl C₁₋₆ alkoxycarbonyloxy, -   C₃₋₇ cycloalkyloxycarbonyloxy, -   heterocyclyloxycarbonyloxy, -   optionally substituted heterocyclyloxy, -   tri C₁₋₆ alkylammonio, -   optionally substituted C₁₋₆ alkylsulfonyl and -   C₁₋₆ alkylsulfamoylcarbonyl, -   or a pharmaceutically acceptable salt thereof; -   [3] the compound of the above-mentioned [1] or [2], wherein the     substituent group α consists of -   a halogen atom, -   hydroxy, -   optionally substituted amino, -   carboxy, -   C₁₋₆ alkoxycarbonyl, -   a sulfonic acid group (sulfo group), -   a phosphoric acid group, -   a di C₁₋₆ alkyl phosphoric acid group, -   cyano, -   C₁₋₆ alkyl, -   C₃₋₇ cycloalkyl, -   C₁₋₆ alkoxy, -   optionally substituted aryl, -   optionally substituted aryloxy, -   aryl C₁₋₆ alkoxy, -   an optionally substituted heterocyclyl group, -   optionally substituted C₁₋₆ alkylcarbonyl, -   heterocyclylcarbonyl, -   optionally substituted C₁₋₆ alkylcarbonyloxy, -   optionally substituted C₃₋₇ cycloalkylcarbonyloxy, -   heterocyclylcarbonyloxy, -   optionally substituted C₁₋₆ alkoxycarbonyloxy, -   optionally substituted heterocyclyl C₁₋₆ alkoxycarbonyloxy, -   C₃₋₇ cycloalkyloxycarbonyloxy, -   heterocyclyloxycarbonyloxy, -   optionally substituted heterocyclyloxy and -   tri C₁₋₆ alkylammonio, -   or a pharmaceutically acceptable salt thereof; -   [4] the compound of the above-mentioned [2], wherein R² is C₁₋₆     alkyl optionally substituted by substituent(s) selected from     substituent group α, C₂₋₆ alkenyl optionally substituted by     substituent(s) selected from substituent group α, -   C₃₋₇ cycloalkyl optionally substituted by substituent(s) selected     from substituent group α, aryl optionally substituted by     substituent(s) selected from substituent group α, aryl C₁₋₆ alkyl     optionally substituted by substituent(s) selected from substituent     group α, or a heterocyclyl group optionally substituted by     substituent(s) selected from substituent group α, and -   the substituent group α consists of -   a halogen atom, hydroxy, optionally substituted amino, carboxy, -   a sulfonic acid group (sulfo group), a phosphoric acid group, cyano,     C₁₋₆ alkyl, C₃₋₇ cycloalkyl, C₁₋₆ alkoxy, aryl and a heterocyclyl     group, -   or a pharmaceutically acceptable salt thereof; -   [5] the compound of the above-mentioned [2], wherein -   R² is -   (1) C₁₋₆ alkyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group, a di C₁₋₆ alkyl     phosphoric acid group, a heterocyclyl group, optionally substituted     C₁₋₆ alkoxy, optionally substituted C₁₋₆ alkylcarbonyloxy,     heterocyclylcarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy and     heterocyclyloxycarbonyloxy; -   (2) C₂₋₆ alkynyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group and a heterocyclyl     group; -   (3) a heterocyclyl group optionally substituted by substituent(s)     selected from hydroxy and optionally substituted C₁₋₆ alkyl; or -   (4) aryl C₁₋₆ alkyl substituted by substituent(s) selected from     hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group and a heterocyclyl     group, -   or a pharmaceutically acceptable salt thereof; -   [6] the compound of the above-mentioned [2], wherein -   R² is -   (1) C₁₋₆ alkyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted C₁₋₆ alkoxy, optionally     substituted C₁₋₆ alkylcarbonyloxy and heterocyclylcarbonyloxy; or -   (2) C₂₋₆ alkynyl optionally substituted by substituent(s) selected     from optionally substituted amino and a heterocyclyl group; or -   (3) a heterocyclyl group optionally substituted by optionally     substituted C₁₋₆ alkyl, -   or a pharmaceutically acceptable salt thereof; -   [7] the compound of any of the above-mentioned [1]-[6], wherein R¹     in the number of n is a hydrogen atom, or a pharmaceutically     acceptable salt thereof; -   [8] the compound of the above-mentioned. [1], which is any of the     compounds of Examples 1-154, or a pharmaceutically acceptable salt     thereof; -   [9] the compound of the above-mentioned [1], which is

-   or a pharmaceutically acceptable salt thereof; -   [10] the compound of the above-mentioned [1], which is

-   or a pharmaceutically acceptable salt thereof; -   [11] the compound of the above-mentioned [1], which is

-   [12] a pharmaceutical composition comprising a compound of any of     the above-mentioned [1]-[11] or a pharmaceutically acceptable salt     thereof as an active ingredient; -   [13] an anticancer agent comprising a compound of any of the     above-mentioned [1]-[11] or a pharmaceutically acceptable salt     thereof as an active ingredient; -   [14] a prophylactic or therapeutic agent for cancer, cancer     metastasis and/or cancer recurrence, comprising a compound of any of     the above-mentioned [1]-[11] or a pharmaceutically acceptable salt     thereof as an active ingredient; -   [15] the agent of the above-mentioned [13] or [14], targeting a     cancer stem cell; -   and the like.

Effect of the Invention

A compound represented by the above-mentioned formula (IA) (hereinafter sometimes to be referred to as compound (IA)) and a pharmaceutically acceptable salt thereof of the present invention are prodrugs which undergo, after administration to the body, metabolism such as hydrolysis and the like under physiological conditions and are converted to a compound represented by the following formula (B′) (hereinafter sometimes to be referred to as compound (B′)), and a compound represented by the formula (I) (hereinafter sometimes to be referred to as compound (I)) and a pharmaceutically acceptable salt thereof, which are encompassed in compound (IA), are prodrugs which undergo, after administration to the body, metabolism such as hydrolysis and the like under physiological conditions and are converted to a compound represented by the following formula (B) (hereinafter sometimes to be referred to as compound (B)). They have high oral absorbability and superior persistence, and are useful as anticancer agents, or agents for the prophylaxis or treatment of cancer metastasis and/or cancer recurrence.

In addition, a medicament containing compound (IA) or compound (I) of the present invention as an active ingredient shows high oral absorbability and less side effects, and therefore, it can be a highly safe therapeutic agent for cancer or an agent for the prophylaxis or treatment of cancer metastasis and/or cancer recurrence. Moreover, since compound (IA) or compound (I) of the present invention show improved water-solubility, compound (IA) or compound (I) can be each prepared as an injection, which is heretofore difficult to prepare from compound (B′) and compound (B).

Compound (IA) or compound (I) of the present invention, or a pharmaceutically acceptable salt thereof are useful as agents for the prophylaxis or treatment of, but are not limited to, breast cancer, head and neck cancer, lung cancer, ovarian cancer, pancreatic cancer, colonrectal cancer, prostate cancer, esophageal cancer, nasopharyngeal cancer, pituitary cancer, gallbladder cancer, thyroid cancer, salivary gland cancer, urinary bladder cancer, renal cell carcinoma, melanoma, hepatoma, cervical cancer, endometrial carcinoma, Kaposi's sarcoma, Ewing's sarcoma, medulloblastoma, sarcoma, brain tumor, gastric cancer, multiple myeloma, leukemia or lymphoma.

DESCRIPTION OF EMBODIMENTS

The present invention is explained in detail in the following.

The definition of the term and each symbol used in the present specification is explained in the following.

In the present specification, the “halogen atom” refers to a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.

In the present specification, the “C₁₋₆ alkyl” means a linear or branched chain monovalent saturated hydrocarbon group having 1-6 carbon atoms. Examples of the “C₁₋₆ alkyl” include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, 1-ethylpropyl, 4-methylpentyl, hexyl and the like.

In the present specification, the “C₁₋₁₂ alkyl” means a linear or branched chain monovalent saturated hydrocarbon group having 1-12 carbon atoms. Examples of the “C₁₋₁₂ alkyl” include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, isopentyl, neopentyl, 1-ethylpropyl, 4-methylpentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl and the like.

In the present specification, the “C₃₋₇ cycloalkyl” means a monovalent group induced from a saturated hydrocarbon ring having 3-7 carbon atoms. The “cycloalkyl” may be crosslinked. Examples of the “C₃₋₇ cycloalkyl” include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and the like.

In the present specification, the “C₃₋₇ cycloalkyl C₁₋₆ alkyl” means a monovalent group wherein the aforementioned “C₃₋₇ cycloalkyl” is bonded to the aforementioned “C₁₋₆ alkyl”. Examples of the “C₃₋₇ cycloalkyl C₁₋₆ alkyl” include cyclopropylmethyl, cyclobutylmethyl, cyclopentylmethyl, cyclohexylmethyl, cycloheptylmethyl and the like.

In the present specification, the “C₁₋₄ alkylene” means a linear or branched chain divalent saturated hydrocarbon group having 1-4 carbon atoms. Examples of the “C₁₋₄ alkylene” include methylene, ethylene, propane-1,3-diyl, butane-1,4-diyl and the like.

In the present specification, the “C₃₋₇ cycloalkenyl” means a monovalent group induced from an unsaturated hydrocarbon ring having 3-7 carbon atoms. The “cycloalkenyl” may be crosslinked. Examples of the “C₃₋₇ cycloalkenyl” include cyclopropenyl, cyclobutenyl, cyclopentenyl, cyclohexenyl, cycloheptenyl and the like.

In the present specification, the “C₂₋₆ alkenyl” means a linear or branched chain monovalent hydrocarbon group having one or more carbon-carbon double bond and 2-6 carbon atoms. Examples of the “C₂₋₅ alkenyl” include vinyl, 1-propenyl (allyl), 2-propenyl, isopropenyl, 2-methyl-1-propenyl, 1-butenyl, 2-butenyl, 3-butenyl, 2-buten-2-yl, 3-methyl-2-butenyl, 3-methyl-2-buten-2-yl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 2-penten-2-yl, 2-penten-3-yl, 4-methyl-1-pentenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, butadienyl (e.g., but-1,3-dien-1-yl), pentadienyl (e.g., penta-1,3-dien-1-yl) and the like.

In the present specification, the “C₂₋₆ alkynyl” means a linear or branched chain monovalent hydrocarbon group having one or more carbon-carbon triple bonds and 2-6 carbon atoms. Examples of the “C₂₋₆ alkynyl” include ethenyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 3-methyl-2-butynyl, 1-pentynyl, 2-pentynyl, 3-pentynyl, 4-pentynyl, 4-methyl-1-pentynyl and the like.

In the present specification, the “C₁₋₆ alkoxy” means a group wherein the aforementioned “C₁₋₅ alkyl” group is bonded to an oxygen atom, i.e., a straight chain or branched chain alkoxy group having 1-6 carbon atoms. Examples of the “C₁₋₆ alkoxy” include methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy, tert-butoxy, pentyloxy, isopentyloxy, neopentyloxy, 1-ethylpropyloxy, hexyloxy and the like.

In the present specification, the “C₁₋₄ alkylenedioxy” means a divalent group wherein an oxygen atom is bonded to each of the two binding sites of the aforementioned “C₁₋₄ alkylene” group. Examples of the “C₁₋₄ alkylenedioxy” include methylenedioxy, ethylenedioxy, propane-1,3-dioxy, butane-1,4-dioxy and the like.

In the present specification, the “C₁₋₆ alkylthio” means a group wherein the aforementioned “C₁₋₆ alkyl” group is bonded to a sulfur atom, i.e., a straight chain or branched chain alkylthio group having 1-6 carbon atoms. Examples of the “C₁₋₆ alkylthio” include methylthio, ethylthio, propylthio, isopropylthio, butylthio, isobutylthio, sec-butylthio, tert-butylthio, pentylthio, isopentylthio, neopentylthio, 1-ethylpropylthio, hexylthio and the like.

In the present specification, the “C₁₋₆ alkoxycarbonyl” means a group wherein the aforementioned “C₁₋₆ alkoxy” group is bonded to carbonyl, i.e., a straight chain or branched chain alkoxy-carbonyl group having 1-6 carbon atoms. Examples of the “C₁₋₆ alkoxycarbonyl” include methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, isobutoxycarbonyl, sec-butoxycarbonyl, tert-butoxycarbonyl, pentyloxycarbonyl, isopentyloxycarbonyl, neopentyloxycarbonyl, 1-ethylpropyloxycarbonyl, hexyloxycarbonyl and the like.

In the present specification, the “C₁₋₆ alkylsulfamoylcarbonyl” means a group wherein the nitrogen atom of a “C₁₋₆ alkylsulfamoyl (C₁₋₆ alkyl-S(O)₂NH₂)” group is bonded to carbonyl, i.e., a straight chain or branched chain alkylsulfamoyl-carbonyl group having 1-6 carbon atoms. Examples of the “C₁₋₆ alkylsulfamoylcarbonyl” include methanesulfamoylcarbonyl and the like.

In the present specification, the “di C₁₋₆ alkyl phosphoric acid group” means a monovalent group wherein the same or different the aforementioned two “C₁₋₆ alkyl” groups are esterified to a phosphoric acid group. Examples of the “di C₁₋₆ alkyl phosphoric acid group” include dimethylphosphoric acid group, diethylphosphoric acid group, dipropylphosphoric acid group, diisopropylphosphoric acid group, dibutylphosphoric acid group, diisobutylphosphoric acid group, di sec-butylphosphoric acid group, di-tert-butylphosphoric acid group and the like.

In the present specification, the “aryl” means a monovalent aromatic hydrocarbon group having 6-14 carbon atoms. Examples of the “aryl” include phenyl, naphthyl (e.g., 1-naphthyl, 2-naphthyl), acenaphthylenyl, azulenyl, anthryl, phenanthryl and the like.

In the present specification, the “aryloxy” means a monovalent group wherein the aforementioned “aryl” group is bonded to an oxygen atom. Examples of the “aryloxy” include phenoxy, naphthyloxy (e.g., 1-naphthyloxy, 2-naphthyloxy), acenaphthylenyloxy, azulenyloxy, anthryloxy, phenanthryloxy and the like.

In the present specification, the “arylthio” means a monovalent group wherein the aforementioned “aryl” group is bonded to a sulfur atom. Examples of the “arylthio” include phenylthio, naphthylthio (e.g., 1-naphthylthio, 2-naphthylthio), acenaphthylenylthio, azulenylthio, anthrylthio, phenanthrylthio and the like.

In the present specification, the “aryl C₁₋₆ alkyl” means a monovalent group wherein the aforementioned “aryl” group is bonded to the aforementioned “C₁₋₆ alkyl”. Examples of the “aryl C₁₋₆ alkyl” include benzyl, naphthylmethyl, 2-phenylethyl, 1-phenylethyl, 1-phenylpropyl and the like.

In the present specification, the “aryl C₁₋₆ alkoxy” means a monovalent group wherein the aforementioned “aryl C₁₋₆ alkyl” group is bonded to an oxygen atom. Examples of the “aryl C₁₋₆ alkoxy” include benzyloxy, naphthylmethyloxy, 2-phenylethyloxy, 1-phenylethyloxy, 1-phenylpropyloxy and the like.

In the present specification, the “heterocyclyl group” means a 3- to 14-membered (monocyclic, bicyclic or tricyclic) heterocyclyl group containing at least one hetero atom selected from the group consisting of oxygen atom, nitrogen atom and sulfur atom, and aromatic heterocycle and non-aromatic heterocycle can be mentioned.

In the present specification, the “aromatic heterocyclyl group” means a monovalent 5- to 14-membered monocyclic aromatic heterocyclyl group and a fused aromatic heterocyclyl group, each containing at least one hetero atom selected from the group consisting of oxygen atom, nitrogen atom and sulfur atom. The fused aromatic heterocyclyl group in the present invention is bi or tricyclic, and optionally has a hetero atom on plural rings. As the monocyclic aromatic heterocyclyl group, a 5- or 6-membered ring group can be mentioned; and as a fused aromatic heterocyclyl group, a group wherein each ring constituting the group is a 5- or 6-membered ring can be mentioned. Examples of the “aromatic heterocyclyl group” include monocyclic aromatic heterocyclyl groups such as furyl, thienyl, pyrrolyl, imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, triazolyl, tetrazolyl, thiadiazolyl, oxadiazolyl, pyridyl, pyridazinyl, pyrimidinyl and the like, fused aromatic heterocyclyl groups such as indolyl, isoindolyl, indazolyl, benzofuranyl, benzothiophenyl, benzimidazolyl (e.g., 5-benzimidazolyl), benzoxazolyl, benzothiazolyl, quinolyl, isoquinolyl, benzoxazinyl, benzothiazinyl, furo[2,3-b]pyridyl, thieno[2,3-b]pyridyl, naphthyridinyl, imidazopyridyl, oxazolopyridyl, thiazolopyridyl, quinolyl, carbazolyl, dibenzothiophenyl and the like.

In the present specification, the “nonaromatic heterocyclyl group” means a monovalent 3- to 14-membered monocyclic nonaromatic heterocyclyl group or a fused nonaromatic heterocyclyl group, each containing at least one hetero atom selected from the group consisting of oxygen atom, nitrogen atom and sulfur atom. The fused nonaromatic heterocyclyl group in the present invention is bi or tricyclic and optionally has a hetero atom on both rings. As the monocyclic nonaromatic heterocyclyl group, a 3- to 9-membered ring group can be mentioned; and as a fused nonaromatic heterocyclyl group, a group wherein each ring constituting the group is a 5- or 6-membered ring can be mentioned. Examples of the “nonaromatic heterocyclyl group” include monocyclic nonaromatic heterocyclyl groups such as oxetanyl (e.g., 3-oxetanyl), tetrahydrofuryl (e.g., tetrahydrofuran-3-yl), dioxolyl (e.g., 1,3-dioxol-4-yl), dioxolanyl (e.g., 1,3-dioxolan-4-yl), oxazolidinyl, imidazolinyl (e.g., 1-imidazolinyl, 2-imidazolinyl, 4-imidazolinyl), aziridinyl (e.g., 1-aziridinyl, 2-aziridinyl), azetidinyl (e.g., 1-azetidinyl, 2-azetidinyl, 3-azetidinyl), pyrrolidinyl (e.g., 1-pyrrolidinyl, 2-pyrrolidinyl, 3-pyrrolidinyl), piperidyl (e.g., 1-piperidyl, 2-piperidyl, 3-piperidyl, 4-piperidyl), dioxanyl (e.g., 1,4-dioxan-2-yl), azepanyl (e.g., 1-azepanyl, 2-azepanyl, 3-azepanyl, 4-azepanyl), azocanyl (e.g., 1-azocanyl, 2-azocanyl, 3-azocanyl, 4-azocanyl), azonanyl (e.g., 1-azonanyl, 2-azonanyl, 3-azonanyl, 4-azonanyl, 5-azonanyl), piperazinyl (e.g., 1,4-piperazin-1-yl, 1,4-piperazin-2-yl), diazepinyl (e.g., 1,4-diazepin-1-yl, 1,4-diazepin-2-yl, 1,4-diazepin-5-yl, 1,4-diazepin-6-yl), diazocanyl (e.g., 1,4-diazocan-1-yl, 1,4-diazocane-2-yl, 1,4-diazocane-5-yl, 1,4-diazocane-6-yl, 1,5-diazocan-1-yl, 1,5-diazocane-2-yl, 1,5-diazocane-3-yl), tetrahydropyranyl (e.g., tetrahydropyran-4-yl, tetrahydropyran-2-yl), morpholinyl (e.g., 4-morpholinyl), thiomorpholinyl (e.g., 4-thiomorpholinyl), 2-oxazolidinyl, dihydrofuryl, dihydropyranyl and the like, a fused nonaromatic heterocyclyl groups such as dihydroquinolyl, dihydroisoquinolyl (e.g., 3,4-dihydroisoquinolin-2-yl), dihydroindole (e.g., 2,3-dihydroindol-5-yl, 2,3-dihydroindol-1-yl), dihydroisoindole (e.g., 2,3-dihydroisoindol-2-yl) and the like, and the like.

In the present specification, the “heterocyclylcarbonyl” means a monovalent group wherein the aforementioned “heterocyclyl” group is bonded to a carbonyl. Preferable examples of the “heterocyclylcarbonyl” include morpholinocarbonyl, piperidinocarbonyl and the like.

In the present specification, the “heterocyclylcarbonyloxy” means a monovalent group wherein the aforementioned “heterocyclylcarbonyl” group is bonded to an oxygen atom. Preferable examples of the “heterocyclylcarbonyloxy” include tetrahydropyran-4-ylcarbonyloxy, piperidin-4-ylcarbonyloxy, pyrrolidin-2-ylcarbonyloxy, azetidin-3-ylcarbonyloxy and the like.

In the present specification, the “C₁₋₆ alkylcarbonyloxy” means a monovalent group wherein the aforementioned “C₁₋₆ alkyl” group is bonded to carbonyloxy. Examples of the “C₁₋₆ alkylcarbonyloxy” include acetyloxy, propionyloxy, butyryloxy, isobutyryloxy, pentanoyloxy, isopentanoyloxy, 1-methylbutyryloxy, pivaloyloxy, hexanoyloxy, isohexanoyloxy, 3,3-dimethylbutyryloxy, 1-ethylbutyryloxy, 4-methylhexanoyloxy, heptanoyloxy and the like.

In the present specification, the “arylcarbonyloxy” means a monovalent group wherein the aforementioned “aryl” group is bonded to carbonyloxy. Preferable examples of the “arylcarbonyloxy” include benzoyloxy and the like.

In the present specification, the “C₃₋₇ cycloalkylcarbonyloxy” means a monovalent group wherein the aforementioned “C₃₋₇ cycloalkyl” group is bonded to carbonyloxy. Examples of the “C₃₋₇ cycloalkylcarbonyloxy” include cyclopropylcarbonyloxy, cyclobutylcarbonyloxy, cyclopentylcarbonyloxy, cyclohexylcarbonyloxy, cycloheptylcarbonyloxy and the like.

In the present specification, the “C₁₋₆ alkoxycarbonyloxy” means a monovalent group wherein the aforementioned “C₁₋₆ alkoxycarbonyl” group is bonded to an oxygen atom. Examples of the “C₁₋₆ alkoxycarbonyloxy” include methoxycarbonyloxy, ethoxycarbonyloxy, propoxycarbonyloxy, isopropoxycarbonyloxy, butoxycarbonyloxy, isobutoxycarbonyloxy, sec-butoxycarbonyloxy, tert-butoxycarbonyloxy, pentyloxycarbonyloxy, isopentyloxycarbonyloxy, neopentyloxycarbonyloxy, 1-ethylpropyloxycarbonyloxy, hexyloxycarbonyloxy and the like.

In the present specification, the “heterocyclyl C₁₋₆ alkoxycarbonyloxy” means a monovalent group wherein the aforementioned “heterocyclyl” group is bonded to the aforementioned “C₁₋₆ alkoxycarbonyloxy”. Preferable examples of the “heterocyclyl C₁₋₆ alkoxycarbonyloxy” include dioxolan-4-ylmethoxycarbonyloxy and the like.

In the present specification, the “C₃₋₇ cycloalkyloxycarbonyloxy” means a “C₃₋₇ cycloalkyloxycarbonyloxy” wherein the C₃₋₇ cycloalkyl moiety is the aforementioned “C₃₋₇ cycloalkyl” group. Examples of the “C₃₋₇ cycloalkyloxycarbonyloxy” include cyclopropyloxycarbonyloxy, cyclobutyloxycarbonyloxy, cyclopentyloxycarbonyloxy, cyclohexyloxycarbonyloxy, cycloheptyloxycarbonyloxy and the like.

In the present specification, the “heterocyclyloxycarbonyloxy” means a “heterocyclyloxycarbonyloxy” wherein the heterocyclyl moiety is the aforementioned “heterocyclyl” group. Preferable examples of the “heterocyclyloxycarbonyloxy” include tetrahydropyran-4-yloxycarbonyloxy and the like.

In the present specification, the “heterocyclyloxy” means a monovalent group wherein the aforementioned “heterocyclyl” group is bonded to an oxygen atom. Preferable examples of the “heterocyclyloxy” include tetrahydropyran-2-yloxy and the like.

In the present specification, the “tri C₁₋₆ alkylammonio” means a “tri C₁₋₆ alkylammonio” wherein the C₁₋₆ alkyl moiety is the aforementioned “C₁₋₆ alkyl” group. Preferable examples of the “tri C₁₋₆ alkylammonio” include trimethylammonio, triethylammonio and the like.

Being “optionally substituted” means an embodiment of being unsubstituted or substituted by 1-4 substituents. When di- to tetra-substituted, the respective substituents may be the same or different.

Being “substituted” means an embodiment of being substituted by 1-4 substituents. When di- to tetra-substituted, the respective substituents may be the same or different.

In the present specification, the “optionally substituted C₁₋₆ alkyl” means C₁₋₆ alkyl optionally substituted by 1-4 substituents selected from a halogen atom, hydroxy, carboxy, cyano, nitro, optionally substituted amino, a sulfonic acid group (sulfo group), a phosphoric acid group, a di C₁₋₆ alkyl phosphoric acid group, optionally substituted C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, a heterocyclyl group, optionally substituted C₁₋₆ alkylcarbonyloxy, heterocyclylcarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy, and heterocyclyloxycarbonyloxy. Preferable examples of the “optionally substituted C₁₋₆ alkyl” include 2-aminoethyl, 2-hydroxyethyl, 2-carboxyethyl and the like.

In the present specification, the “optionally substituted C₁₋₆ alkoxy” means C₁₋₆ alkoxy optionally substituted by 1-4 substituents selected from a halogen atom, hydroxy, carboxy, cyano, nitro, optionally substituted amino, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, C₁₋₆ alkylsulfamoylcarbonyl, and a heterocyclyl group. Preferable examples of the “optionally substituted C₁₋₆ alkoxy” include 2-diethylaminoethoxy, 2-carboxyethoxy, 2-methanesulfamoylcarbonylethoxy, 2-hydroxyethoxy, 2,3-dihydroxypropoxy, 1,3-dihydroxy-2-propoxy, 2-[2-(2-hydroxyethoxy)ethoxy]ethoxy and the like.

In the present specification, the “optionally substituted amino” means an amino optionally substituted by 1 or 2 substituents selected from C₁₋₆ alkyl, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, optionally substituted C₁₋₆ alkylcarbonyl, and a heterocyclyl group. Examples of the “optionally substituted amino” include amino, methylamino, ethylamino, propylamino, isopropylamino, butylamino, isobutylamino, sec-butylamino, tert-butylamino, cyclopropylamino, cyclobutylamino, 1-propenylamino (allylamino), phenylamino, naphthylamino (e.g., 1-naphthylamino, 2-naphthylamino), benzylamino, naphthylmethylamino, 2-phenylethylamino, pyridylamino, dimethylamino, diethylamino, N-methyl-N-ethylamino, N-methyl-N-(2-amino-3-methylbutyryl)amino and the like.

In the present specification, the “optionally substituted aryl” means an aryl optionally substituted by 1-4 substituents selected from C₁₋₆ alkyl, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano, and nitro. Preferable examples of the “optionally substituted aryl” include 4-carboxyphenyl and the like.

In the present specification, the “optionally substituted aryloxy” means aryloxy optionally substituted by 1-4 substituents selected from C₁₋₆ alkyl optionally substituted by substituent(s) selected from amino and carboxy, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano, and nitro. Preferable examples of the “optionally substituted aryloxy” include 4-(2-amino-2-carboxyethyl)phenoxy and the like.

In the present specification, the “optionally substituted heterocyclyl group” means a heterocyclyl group optionally substituted by 1-4 substituents selected from C₁₋₆ alkyl, C₁₋₆ alkoxy, cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano, nitro and oxo. Preferable examples of the “optionally substituted heterocyclyl group” include 5-methyl-2-oxo-1,3-dioxol-4-yl, 3,4,5,6-tetrahydroxytetrahydropyran-2-yl, 1,4-dioxan-2-yl, 2,2-dimethyl-1,3-dioxolan-4-yl, 2-oxo-1,3-dioxolan-4-yl, piperazin-1-yl, 4-(2-propenyl)piperazin-1-yl, morpholin-4-yl, 3-pyridyl and the like.

In the present specification, the “optionally substituted C₁₋₆ alkylcarbonyl” means a C₁₋₆ alkylcarbonyl optionally substituted by 1-4 substituents selected from C₁₋₆ alkyl, C₁₋₆ alkylcarbonyloxy, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano and nitro. Preferable examples of the “optionally substituted C₁₋₆ alkylcarbonyl” include carboxyacetyl and the like.

In the present specification, the “optionally substituted C₁₋₆ alkylcarbonyloxy” means C₁₋₆ alkylcarbonyloxy optionally substituted by 1-4 substituents selected from C₁₋₆ alkyl, C₁₋₆ alkylcarbonyloxy, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano and nitro. Preferable examples of the “optionally substituted C₁₋₆ alkylcarbonyloxy” include

-   acetyloxy, -   isobutyryloxy, -   pivaloyloxy, -   hydroxyacetyloxy, -   1-ethylbutyryloxy, -   2-hydroxy-2-methylpropionyloxy, -   3-hydroxypropionyloxy, -   3-hydroxy-2,2-dimethylpropionyloxy, -   3-acetoxy-2,2-dimethylpropionyloxy, -   3-methoxy-2,2-dimethylpropionyloxy, -   2′-aminopropionyloxy-2,2-dimethylpropionyloxy, -   2,3-dihydroxypropionyloxy, -   2,6-diaminohexanoyloxy, -   2-amino-3-methylbutyryloxy, -   2-aminopropionyloxy, -   2-amino-3-hydroxypropionyloxy, -   2-amino-3-phenylpropionyloxy, -   aminoacetyloxy, -   3-aminopropionyloxy, -   3-carboxypropionyloxy, -   and the like.

In the present specification, the “optionally substituted C₃₋₇ cycloalkylcarbonyloxy” means C₃₋₇ cycloalkylcarbonyloxy optionally substituted by 1-4 substituents selected from C₁₋₆ alkyl, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano and nitro. Preferable examples of the “optionally substituted C₃₋₇ cycloalkylcarbonyloxy” include cyclohexylcarbonyloxy, 4,4-difluorocyclohexylcarbonyloxy and the like.

In the present specification, the “optionally substituted C₁₋₆ alkoxycarbonyloxy” means C₁₋₆ alkoxycarbonyloxy optionally substituted by 1-4 substituents selected from C₁₋₆ alkyl, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano and nitro. Preferable examples of the “optionally substituted C₁₋₆ alkoxycarbonyloxy” include ethoxycarbonyloxy, 1-ethylpropyloxycarbonyloxy, 2,3-dihydroxypropyloxycarbonyloxy and the like.

In the present specification, the “optionally substituted heterocyclyl C₁₋₆ alkoxycarbonyloxy” means heterocyclyl C₁₋₆ alkoxycarbonyloxy optionally substituted by 1-4 substituents selected from C₁₋₆ alkyl, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano and nitro. Preferable examples of the “optionally substituted heterocyclyl C₁₋₆ alkoxycarbonyloxy” include (2,2-dimethyl-1,3-dioxolan-4-yl)methoxycarbonyloxy and the like.

In the present specification, the “optionally substituted C₁₋₆ alkylsulfonyl” means C₁₋₆ alkylsulfonyl optionally substituted by 1-4 substituents selected from C₁₋₆ alkylcarbonyloxy, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano and nitro. Preferable examples of the “optionally substituted C₁₋₆ alkylsulfonyl” include methanesulfonyl, 2-hydroxyethanesulfonyl, 2-aminoethanesulfonyl and the like.

In the present specification, the “optionally substituted heterocyclyloxy” means heterocyclyloxy optionally substituted by 1-4 substituents selected from C₁₋₆ alkyl optionally substituted by hydroxy, C₁₋₆ alkoxy, C₃₋₇ cycloalkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl, aryl, aryl C₁₋₆ alkyl, a heterocyclyl group, a halogen atom, hydroxy, amino, carboxy, cyano and nitro. Preferable examples of the “optionally substituted heterocyclyloxy” include 3,4,5-trihydroxy-6-hydroxymethyltetrahydropyran-2-yl and the like.

Compound (I) of the present invention or a pharmaceutically acceptable salt thereof is a prodrug to be converted to compound (B) by undergoing metabolism by hydrolysis and the like under physiological conditions after administration into the body. Compound (I) is considered to be converted to compound (B) by hydrolysis of ester group represented by CO₂R² by hydrolases such as esterase and the like under physiological conditions in vivo, followed by decarboxylation.

Therefore, the absorbability and persistence of compound (B) can be controlled by selecting, as a group represented by R², a group which is not easily hydrolyzed under pH environment or by a digestive enzyme in the gastrointestinal tract and, once absorbed, rapidly hydrolyzed by hydrolases such as esterase and the like in vivo. In addition, the intestinal absorbability can be improved by controlling the properties (water-solubility, liposolubility etc.) of compound (I) by introducing a functional group that improves water-solubility into a group represented by R², which further enables use as an injection.

From such aspects, a group for R² is

-   (1) C₁₋₆ alkyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group, a di C₁₋₆ alkyl     phosphoric acid group, a heterocyclyl group, optionally substituted     C₁₋₆ alkoxy, optionally substituted C₁₋₆ alkylcarbonyloxy,     heterocyclylcarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy and     heterocyclyloxycarbonyloxy; -   (2) C₂₋₆ alkynyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group and a heterocyclyl     group; -   (3) a heterocyclyl group optionally substituted by substituent(s)     selected from hydroxy and optionally substituted C₁₋₆ alkyl; or -   (4) aryl C₁₋₆ alkyl substituted by substituent(s) selected from     hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group and a heterocyclyl     group, is preferable, and -   (1) C₁₋₆ alkyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted C₁₋₆ alkoxy, optionally     substituted C₁₋₆ alkylcarbonyloxy and heterocyclylcarbonyloxy; -   (2) C₂₋₆ alkynyl optionally substituted by substituent(s) selected     from optionally substituted amino and a heterocyclyl group; or -   (3) a heterocyclyl group optionally substituted by optionally     substituted C₁₋₆ alkyl, is more preferable.

In another embodiment of the group for R²,

-   (1) C₁₋₆ alkyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group, a heterocyclyl group,     optionally substituted C₁₋₆ alkylcarbonyloxy,     heterocyclylcarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy and     heterocyclyloxycarbonyloxy; -   (2) C₂₋₆ alkynyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group and a heterocyclyl     group; or -   (3) aryl C₁₋₆ alkyl substituted by substituent(s) selected from     hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group and a heterocyclyl     group, is preferable, and -   (1) C₁₋₆ alkyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted C₁₋₆ alkylcarbonyloxy,     heterocyclylcarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy and     heterocyclyloxycarbonyloxy; or -   (2) C₂₋₆ alkynyl optionally substituted by optionally substituted     amino, is more preferable.

In still another embodiment of the group for R²,

-   (1) C₁₋₆ alkyl optionally substituted by substituent(s) selected     from hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group and a heterocyclyl     group; or -   (2) aryl C₁₋₆ alkyl substituted by substituent(s) selected from     hydroxy, optionally substituted amino, carboxy, a sulfonic acid     group (sulfo group), a phosphoric acid group and a heterocyclyl     group, is preferable, though it is not limited as long as the     above-mentioned object can be achieved.

As a group for R¹, a hydrogen atom is preferable.

The method for producing a prodrug of the present invention is preferably applied to compound (B), and also similarly preferably applied to compound (B′), but is not limited to these.

When compound (IA) or compound (I) contains optical isomer, stereoisomer, regio isomer, or rotamer, these are also included in compound (IA) or compound (I).

Compound (IA) and compound (I) have a β-ketoester structure in the structural formulas, and may be, in view of the properties thereof, an enol form tautomer represented by the following formula (I′A) or (I′). The tautomer represented by the formula (I′A) or (I′), or a salt thereof are also included in the compound of the present invention (IA) or compound (I).

(wherein each symbol is as defined above.)

The salt of the tautomer represented by the above-mentioned formula (I′A) or (I′) is not particularly limited and, for example, alkali metal salt; alkaline earth metal salt; salt with organic base; amino acid salt and the like can be mentioned. As the alkali metal salt, sodium salt, potassium salt, lithium salt and the like can be preferably mentioned, as the alkaline earth metal salt, magnesium salt, calcium salt and the like can be preferably mentioned, as the salt with organic base, N-methylmorpholine salt, ethanolamine salt, piperazine salt, diethylamine salt, triethylamine salt, tributylamine salt, tert-butylamine salt, diisopropylethylamine salt, dicyclohexylamine salt, N-methylpiperidine salt, meglumine salt, tromethamine salt, choline salt, benzathine salt, 4-phenylcyclohexylamine salt, pyridine salt, 4-pyrrolidinopyridine salt, picoline salt and the like can be preferably mentioned, and as the amino acid salt, glycine salt, lysine salt, arginine salt, ornithine salt, glutamic acid salt, aspartic acid salt and the like can be preferably mentioned.

Compound (IA) and compound (I) of the present invention can be converted to pharmaceutically acceptable salts thereof according to a method known per se. When the compound (I) of the present invention has an acidic group or basic group, it is reacted with a base or acid to give a basic salt or acidic salt.

A pharmaceutically acceptable “basic salt” of compound (IA) or compound (I) of the present invention is preferably an alkali metal salt such as sodium salt, potassium salt, and lithium salt; alkaline earth metal salt such as magnesium salt, and calcium salt; a salt with organic base such as N-methylmorpholine salt, ethanolamine salt, piperazine salt, diethylamine salt, triethylamine salt, tributylamine salt, tert-butylamine salt, diisopropylethylamine salt, dicyclohexylamine salt, N-methylpiperidine salt, meglumine salt, tromethamine salt, choline salt, benzathine salt, 4-phenylcyclohexylamine salt, pyridine salt, 4-pyrrolidinopyridine salt, and picoline salt or an amino acid salt such as glycine salt, lysine salt, arginine salt, ornithine salt, glutamic acid salt, and aspartic acid salt, preferably an alkali metal salt.

A pharmaceutically acceptable “acidic salt” of compound (IA) or compound (I) of the present invention is preferably inorganic acid salt such as hydrohalide (e.g., hydrofluoride, hydrochloride, hydrobromide, hydroiodide), nitrate, perchlorate, sulfate, phosphate and the like; organic acid salt such as lower alkanesulfonate (e.g., methanesulfonate, trifluoromethanesulfonate, ethanesulfonate), arylsulfonate (e.g., benzenesulfonate, p-toluenesulfonate), acetate, trifluoroacetate, malate, fumarate, succinate, citrate, ascorbate, tartrate, oxalate, maleate and the like; or amino acid salt such as glycine salt, lysine salt, arginine salt, ornithine salt, glutamic acid salt, aspartic acid salt, most preferably hydrohalide (particularly, hydrochloride).

A pharmaceutical composition containing compound (IA) or compound (I) of the present invention, or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier and the like can be administered to mammals (e.g., mouse, rat, hamster, rabbit, cat, dog, bovine, sheep, monkey, human etc.). Examples of the carrier include excipient (e.g., starch, lactose, sugar, calcium carbonate, calcium phosphate etc.), binder (e.g., starch, gum arabic, carboxymethylcellulose, hydroxypropylcellulose, crystalline cellulose etc.), lubricant (e.g., magnesium stearate, talc etc.), disintegrant (e.g., carboxymethylcellulose, talc etc.) and the like.

After mixing the above-mentioned various components, the mixture can be formulated as preparations for oral administration such as capsule, tablet, fine granule, granule, dry syrup and the like, or for parenteral administration such as injection, suppository and the like by a means known per se.

While the content of compound (IA) or compound (I), or a pharmaceutically acceptable salt thereof in the pharmaceutical composition of the present invention varies depending on the form of the preparation, it is generally about 0.01-100 wt %, preferably about 0.1-50 wt %, further preferably about 0.5-20 wt %, relative to the whole preparation.

(Production Method)

The compound (IA) or compound (I) of the present invention can be produced utilizing the characteristics based on the kind of the basic skeleton or substituent, and applying various known production methods. Examples of the known method include the methods described in “ORGANIC FUNCTIONAL GROUP PREPARATIONS”, 2nd edition, ACADEMIC PRESS, INC., 1989, “Comprehensive Organic Transformations”, VCH Publishers Inc., 1989, and the like.

In this case, depending on the kind of the functional group, it is sometimes effective for the production techniques to protect the functional group with a suitable protecting group at the stage of a starting material or intermediate, or replace same with a group easily convertible to the functional group.

Examples of such functional group include amino group, hydroxy group, carboxyl group and the like and examples of the protecting group thereof include the protecting groups described in T. W. Greene and P. G. Wuts, “Protective Groups in Organic Synthesis (3rd ed., 1999)”, from which an appropriate one can be selected and used according to the reaction conditions thereof. According to such method, a desired compound can be obtained by introducing the substituent, performing the reaction, and removing the protecting group as necessary, or converting to a desired group.

The production method of the compound of the present invention is described below. However, the production method is not at all limited by the following methods.

(Production Method 1)

In production method 1, a compound represented by the formula (Ia) (compound (Ia)) is produced by subjecting a compound represented by the formula (1) (compound (1)) to a method known per se to give a compound represented by the formula (2) (compound (2)) as an acid halide, and reacting the obtained compound (2) with a compound represented by the formula (3) (compound (3)).

Compound (1) to be used in this production method can be produced according to a method known per se (e.g., the methods described in patent documents 1-5, the method described in J. Med. Chem., 2012, 55, 7273-7284 etc.).

[wherein n, R¹ and R² are as defined above, and X is a halogen atom (fluorine atom, chlorine atom, bromine atom, iodine atom).]

In production method 1, the reaction of compound (2) and compound (3) is performed in the presence of a base such as magnesium chloride, triethylamine and the like, in an inert solvent. Compound (3) may be used not only in the form of a free acid but also as a salt such as potassium salt, sodium salt, lithium salt and the like.

The inert solvent to be used includes, for example, alcohols such as methanol, ethanol, propanol, 2-propanol and butanol; aromatic hydrocarbons such as benzene, toluene, and xylene; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran, 1,4-dioxane and 1,2-dimethoxyethane; amides such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N-methylpyrrolidinone and hexamethylphosphoric triamide; halogenated hydrocarbons such as methylene chloride, chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, o-dichlorobenzene, m-dichlorobenzene, fluorobenzene, trichloromethylbenzene and trifluoromethylbenzene; acetonitrile; and a mixture of these and the like.

While the reaction conditions such as reaction temperature, reaction time and the like vary depending on the reaction reagent, reaction solvent and the like to be used, they are generally −20 to 100° C. for 30 min to 20 hr.

The amount of compound (3) to be used is not particularly limited, and is generally 1-5 mol, preferably 1-3 mol, per 1 mol of compound (2), and the amounts of magnesium chloride and the base to be used are each generally 2-5 mol, preferably 2-3 mol, per 1 mol of compound (2). Compound (3) to be used in this production method can be produced according to a method known per se.

(Production Method 2)

In production method 2, compound (Ia) is produced by reacting a compound represented by the formula (4) (compound (4)) and a compound represented by the formula (5) (compound (5)).

Compound (4) to be used in this production method can be produced according to a method known per se (e.g., the methods described in patent documents 1-5 etc.).

[wherein n, R¹ and R² are as defined above.]

In production method 2, the reaction of compound (4) and compound (5) is performed in the presence of a base such as sodium hydride and the like in an inert solvent.

The inert solvent to be used includes, for example, alcohols such as methanol, ethanol, propanol, 2-propanol and butanol; aromatic hydrocarbons such as benzene, toluene, and xylene; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran, 1,4-dioxane and 1,2-dimethoxyethane; amides such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N-methylpyrrolidinone and hexamethylphosphoric triamide; halogenated hydrocarbons such as methylene chloride, chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, o-dichlorobenzene, m-dichlorobenzene, fluorobenzene, trichloromethylbenzene and trifluoromethylbenzene; acetonitrile; and a mixture of these and the like.

While the reaction conditions such as reaction temperature, reaction time and the like vary depending on the reaction reagent, reaction solvent and the like to be used, they are generally −20 to 100° C. for 30 min to 20 hr.

The amount of compound (5) to be used is not particularly limited, and is generally 1-5 mol, preferably 1-3 mol, per 1 mol of compound (4), and the amount of the base such as sodium hydride and the like to be used is generally 1-5 mol, preferably 1-3 mol, per 1 mol of compound (4). Compound (5) to be used in this production method can be produced according to a method known per se.

(Production Method 3)

In production method 3, compound (Ia) is produced by reacting a compound represented by the formula (6) (compound (6)) and a compound represented by the formula (7) (compound (7)).

Compound (6) to be used in this production method can be produced according to a method known per se (e.g., the methods described in patent documents 1-5, the method described in J. Med. Chem., 2012, 55, 7273-7284 etc.).

[wherein n, R¹ and R² are as defined above.]

In production method 3, the reaction of compound (6) and compound (7) is performed in the presence of Lewis acid and Meerwein reagent such as trimethyloxonium tetrafluoroborate or triethyloxonium tetrafluoroborate and the like in an inert solvent.

The inert solvent to be used includes, for example, alcohols such as methanol, ethanol, propanol, 2-propanol and butanol; aromatic hydrocarbons such as benzene, toluene, and xylene; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran, 1,4-dioxane and 1,2-dimethoxyethane; amides such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N-methylpyrrolidinone and hexamethylphosphoric triamide; halogenated hydrocarbons such as methylene chloride, chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, o-dichlorobenzene, m-dichlorobenzene, fluorobenzene, trichloromethylbenzene and trifluoromethylbenzene; acetonitrile; and a mixture of these and the like.

While the reaction conditions such as reaction temperature, reaction time and the like vary depending on the reaction reagent, reaction solvent and the like to be used, they are generally −20 to 100° C. for 30 min to 20 hr.

The amount of compound (7) to be used is not particularly limited, and is generally 1-5 mol, preferably 1-3 mol, per 1 mol of compound (6), and the amount of each of the Lewis acid and Meerwein reagent to be used is generally 0.05-2 mol, preferably 0.05-1 mol, per 1 mol of compound (6). Compound (7) to be used in this production method can be produced according to a method known per se.

(Production Method 4)

In production method 4, compound (Ia) is produced by reacting compound (2) and a compound represented by the formula (8) (compound (8)).

[wherein n, R¹, R² and X are as defined above.]

In production method 4, the reaction of compound (2) and compound (8) is performed in the presence of an organolithium compound such as n-butyllithium and the like, and an organic base such as diisopropylamine and the like in an inert solvent.

The inert solvent to be used includes, for example, alcohols such as methanol, ethanol, propanol, 2-propanol and butanol; aromatic hydrocarbons such as benzene, toluene, and xylene; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran, 1,4-dioxane and 1,2-dimethoxyethane; amides such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N-methylpyrrolidinone and hexamethylphosphoric triamide; halogenated hydrocarbons such as methylene chloride, chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, o-dichlorobenzene, m-dichlorobenzene, fluorobenzene, trichloromethylbenzene and trifluoromethylbenzene; acetonitrile; and a mixture of these and the like.

While the reaction conditions such as reaction temperature, reaction time and the like vary depending on the reaction reagent, reaction solvent and the like to be used, they are generally −80 to 20° C. for 30 min to 20 hr.

The amount of compound (8) to be used is not particularly limited, and is generally 1-5 mol, preferably 1-3 mol, per 1 mol of compound (2), the amount of the organolithium compound to be used is generally 1-3 mol, preferably 1-2 mol, per 1 mol of compound (2), and the amount of the organic base to be used is generally 1-5 mol, preferably 1-3 mol, per 1 mol of compound (2). Compound (8) to be used in this production method can be produced according to a method known per se.

(Production Method 5)

In production method 5, compound (Ia) of the present invention is produced by removing the protecting group of compound (Ic) having the protecting group, which can be produced according to production method 1 to production method 4.

[wherein n, R¹ and R² are as defined above, and PG is a protecting group of R².]

In compound (Ic), R² is protected by a protecting group. In this step, the protecting group is removed. The deprotection method of each protecting group can be performed according to the method described in, for example, T. W. Greene and P. G. Wuts, “Protective Groups in Organic Synthesis (3rd ed., 1999)”.

(Production Method 6)

In production method 6, compound (Ia) is produced by reacting compound (2) and compound (9) to give a compound represented by the formula (10) (compound (10)), and reacting compound (10) and a compound represented by the formula (11) (compound (11)).

[wherein n, R¹, R² and X are as defined above.]

In production method 6, the reaction of compound (2) and compound (9) is performed in the presence of a base such as N,N-dimethylaminopyridine and the like in an inert solvent.

The inert solvent to be used includes, for example, alcohols such as methanol, ethanol, propanol, 2-propanol and butanol; aromatic hydrocarbons such as benzene, toluene, and xylene; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran, dioxane and 1,2-dimethoxyethane; amides such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N-methylpyrrolidinone and hexamethylphosphoric triamide; halogenated hydrocarbons such as methylene chloride, chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, o-dichlorobenzene, m-dichlorobenzene, fluorobenzene, trichloromethylbenzene and trifluoromethylbenzene; acetonitrile; and a mixture of these and the like.

While the reaction conditions such as reaction temperature, reaction time and the like vary depending on the reaction reagent, reaction solvent and the like to be used, they are generally −20 to 100° C. for 30 min to 20 hr.

The amount of compound (9) to be used is not particularly limited, and is generally 1-5 mol, preferably 1-3 mol, per 1 mol of compound (2), and the amount of the base to be used is generally 1-5 mol, preferably 2-3 mol, per 1 mol of compound (2).

In production method 6, the reaction of compound (10) and compound (11) is performed in an inert solvent.

The inert solvent to be used includes, for example, alcohols such as methanol, ethanol, propanol, 2-propanol and butanol; aromatic hydrocarbons such as benzene, toluene, and xylene; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran, dioxane and 1,2-dimethoxyethane; amides such as N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N-methylpyrrolidinone and hexamethylphosphoric triamide; halogenated hydrocarbons such as methylene chloride, chloroform, carbon tetrachloride, dichloroethane, chlorobenzene, o-dichlorobenzene, m-dichlorobenzene, fluorobenzene, trichloromethylbenzene and trifluoromethylbenzene; acetonitrile; and a mixture of these and the like.

While the reaction conditions such as reaction temperature, reaction time and the like vary depending on the reaction reagent, reaction solvent and the like to be used, they are generally 0 to 150° C. for 10 min to 20 hr.

The amount of compound (11) to be used is not particularly limited, and is generally 1-5 mol, preferably 1-3 mol, per 1 mol of compound (10).

Compound (IA) of the present invention can also be produced from a starting compound having R³, by a method similar to the above-mentioned production methods 1-6.

The compound (IA) or compound (I) of the present invention produced above can be isolated and purified by a known method, for example, extraction, precipitation, distillation, chromatography, fractional recrystallization, recrystallization and the like.

When the compound (IA) or compound (I) of the present invention or an intermediate in the production thereof has an asymmetric carbon, optical isomers are present. These optical isomers can be each isolated and purified by a conventional method such as fractional recrystallization (salt resolution) for recrystallization with an appropriate salt, column chromatography and the like. The above-mentioned isomers can also be produced by asymmetric synthesis. As a reference document of a method of resolving an optical isomer of the above-mentioned isomer from a racemate, J. Jacques et al, “Enantiomers, Racemates and Resolution, John Wiley And Sons, Inc.” can be mentioned.

While the dose of compound (IA) or compound (I), or a pharmaceutically acceptable salt thereof of the present invention varies depending on the subject of administration, symptoms, and other factors, a single dose of about 1-500 mg is given about 1-3 times per day for oral administration to an adult, for example, a cancer patient.

Compound (IA) or compound (I), or a pharmaceutically acceptable salt thereof of the present invention are prodrug compounds having high solubility and high oral absorbability, which are converted, after administration, to compound (B′) or compound (B) having a particularly superior anticancer action on cancer cells and capable of inducing apoptosis of cancer stem cells, and show superior persistence. They are useful as anticancer agents, or agents for the prophylaxis or treatment of cancer metastasis and/or cancer recurrence.

While the kind of cancer to be the prophylaxis or treatment target is not particularly limited, they are useful for the prophylaxis or treatment of, for example, breast cancer, head and neck cancer, lung cancer, ovarian cancer, pancreatic cancer, colonrectal cancer, prostate cancer, esophageal cancer, nasopharyngeal cancer, pituitary cancer, gallbladder cancer, thyroid cancer, salivary gland cancer, urinary bladder cancer, renal cell carcinoma, melanoma, hepatoma, cervical cancer, endometrial carcinoma, Kaposi's sarcoma, Ewing's sarcoma, medulloblastoma, sarcoma, brain tumor, gastric cancer, multiple myeloma, leukemia, lymphoma and the like, and have a particularly superior apoptosis inducing action on the cancer stem cells of these.

Compound (IA) or compound (I), or a pharmaceutically acceptable salt thereof of the present invention can be used in combination with other medicaments, for example, existing anticancer agents, as long as the efficacy thereof is not impaired. In this case, the administration period is not limited, and these can be administered simultaneously, or may be administered at different times, to the subject of administration. As the dose, a clinically-used dose can be appropriately selected as the standard. The mixing ratio of compound (IA) or compound (I), or a pharmaceutically acceptable salt thereof of the present invention or the like and a concomitant drug can be appropriately selected according to the subject of administration, administration route, target disease, symptom, combination and the like.

Examples of the existing anticancer agent include chemotherapeutic agent, hormonal therapeutic agent, immunotherapeutic agent, molecular targeted drug and the like.

As the “chemotherapeutic agent”, alkylating agent, metabolic antagonist, antitumor antibiotic, plant-derived antitumor drug and the like are used.

As the “alkylating agent”, nitrogen mustard, nitrogen mustard-N-oxide hydrochloride, chlorambucil, cyclophosphamide, ifosfamide, thiotepa, carboquone, improsulfan tosylate, busulfan, nimustine hydrochloride, mitobronitol, melphalan, dacarbazine, ranimustine, estramustine phosphate sodium, triethylenemelamine, carmustine, lomustine, streptozocin, pipobroman, etoglucid, carboplatin, cisplatin, miboplatin, nedaplatin, oxaliplatin, altretamine, ambamustine, dibrospidium hydrochloride, fotemustine, prednimustine, pumitepa, ribomustin, temozolomide, treosulphan, trofosfamide, zinostatin stimalamer, adozelesin, cystemustine, bizelesin, and DDS preparations thereof and the like are used.

As the “metabolic antagonist”, mercaptopurine, 6-mercaptopurine riboside, thioinosine, methotrexate, pemetrexed, enocitabine, cytarabine, cytarabine ocfosfate, ancitabine hydrochloride, 5-FU drug (e.g., fluorouracil, tegafur, UFT, doxifluridine, carmofur, gallocitabine, emitefur, capecitabine), aminopterin, nelzarabine, leucovorin calcium, tabloid, butocine, folinate calcium, levofolinate calcium, cladribine, emitefur, fludarabine, gemcitabine, hydroxycarbamide, pentostatin, piritrexim, idoxuridine, mitoguazone, tiazofurine, ambamustine, bendamustine, and DDS preparations thereof and the like are used.

As the “antitumor antibiotic”, actinomycin D, actinomycin C, mitomycin C, chromomycin A3, bleomycin hydrochloride, bleomycin sulfate, peplomycin sulfate, daunorubicin hydrochloride, doxorubicin hydrochloride, aclarubicin hydrochloride, pirarubicin hydrochloride, epirubicin hydrochloride, neocarzinostatin, mithramycin, sarcomycin, carzinophilin, mitotane, zorubicin hydrochloride, mitoxantrone hydrochloride, idarubicin hydrochloride, and DDS preparations thereof and the like are used.

As the “plant-derived antitumor drug”, etoposide, etoposide phosphate, vinblastine sulfate, vincristine sulfate, vindesine sulfate, teniposide, paclitaxel, docetaxel, vinorelbine, and DDS preparations thereof and the like are used.

As the “hormonal therapeutic agent”, fosfestrol, diethylstilbestrol, chlorotrianisene, medroxyprogesterone acetate, megestrol acetate, chlormadinone acetate, cyproterone acetate, danazol, allylestrenol, gestrinone, mepartricin, raloxifene, ormeloxifene, levormeloxifene, anti-estrogen (e.g., tamoxifen citrate, toremifene citrate), pill preparation, mepitiostane, testololactone, aminoglutethimide, LH-RH agonist (e.g., goserelin acetate, buserelin, leuprorelin), droloxifene, epitiostanol, ethinylestradiol sulfonate, aromatase inhibitor (e.g., fadrozole hydrochloride, anastrozole, letrozole, exemestane, vorozole, formestane), anti-androgen (e.g., flutamide, bicalutamide, nilutamide), 5α-reductase inhibitor (e.g., finasteride, epiristeride), adrenocorticohormone drug (e.g., dexamethasone, prednisolone, betamethasone, triamcinolone), androgen synthesis inhibitor (e.g., abiraterone), retinoid and drugs that retard retinoid metabolism (e.g., liarozole) and the like are used.

As the “immunotherapeutic agent”, biological response modifier (e.g., picibanil, krestin, schizophyllan, lentinan, ubenimex, interferon, interleukin, macrophagecolony stimulating factor, granulocyte colony stimulating factor, erythropoietin, lymphotoxin, BCG vaccine, corynebacterium parvum, levamisole, polysaccharide K, procodazole, anti-CTLA4 antibody) and the like are used.

As the “molecular targeted drug”, tositumomab, ibritumomab, alemtuzumab, axitinib, bevacizumab, afatinib, bortezomib, bosutinib, carfilzomib, cetuximab, dasatinib, denosumab, edrecolomab, erlotinib, everolimus, vismodegib, gefitinib, gemtuzumab ozogamicin, imatinib, ipilimumab, lapatinib, lenalidomide, nilotinib, nimotuzumab, olaparib, panitumumab, pazopanib, pertuzumab, rituximab, siltuximab, sorafenib, sunitinib, tamibarotene, temsirolimus, thalidomide, trastuzumab, tretinoin, vandetanib, vorinostat, cabozantinib, trametinib, dabrafenib, alectinib, ceritinib, ibrutinib, palbociclib, regorafenib and the like are used.

EXAMPLES

The present invention is explained in detail in the following by referring to Examples, which are not to be construed as limitative.

Example 1 Isobutyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate (1a) 4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-carbonyl Chloride

4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-carboxylic acid (150 mg, 0.62 mmol) synthesized by the method described in J. Med. Chem., 2012, 55, 7273-7284 was suspended in methylene chloride (6 mL), oxalyl chloride (0.06 mL, 0.70 mmol), and then one drop of N,N-dimethylformamide were added thereto at room temperature, and the mixture was stirred at room temperature for 30 min. The solvent in the reaction mixture was evaporated under reduced pressure to give 4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-carbonyl chloride as a yellow powder (160 mg, yield 99%).

¹H-NMR (CDCl₃, 400 MHz) δ: 7.69 (1H, s), 7.87-7.96 (2H, m), 8.09-8.18 (2H, m).

(1b) Isobutyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

Monoisobutyl malonate (200 mg, 1.25 mmol) was dissolved in acetonitrile (3 mL), triethylamine (0.28 mL, 2.0 mmol) and then magnesium chloride (150 mg, 1.6 mmol) were added thereto under ice-cooling, and the mixture was stirred under a nitrogen stream at room temperature for 1.5 hr. To the obtained solution were added, under ice-cooling, a solution of the compound (165 mg, 0.633 mmol) of Example 1(1a) in methylene chloride (4.5 mL)-acetonitrile (1.5 mL), and then triethylamine (0.19 mL, 1.4 mmol), and the mixture was stirred at 60° C. for 2 hr. To the reaction mixture were added ethyl acetate and water, and the mixture was acidified with 6M hydrochloric acid. After separation into two layers, the ethyl acetate layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the obtained powder was purified by silica gel column chromatography (n-hexane:ethyl acetate, 10:1→7:1, V/V), and the solvent in the object fraction was evaporated under reduced pressure. To the obtained residue was added n-hexane, and the mixture was collected by filtration to give isobutyl 3-(4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate as a yellow powder (147 mg, yield 70%).

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.86 (5.4H, d, J=6.7 Hz), 0.93 (0.6H, d, J=6.7 Hz), 1.81-1.92 (0.9H, m), 1.92-2.03 (0.1H, m), 3.89 (1.8H, d, J=6.7 Hz), 4.00 (0.2H, d, J=6.7 Hz), 4.23 (1.8H, s), 6.02 (0.1H, s), 7.72 (0.1H, s), 7.85-7.96 (2H, m), 8.08-8.18 (2H, m), 8.16 (0.9H, s).

MS (ESI) m/z: 363 (M+Na)⁺.

According to Example 1, the compounds of Examples 2-5 were synthesized.

Example 2 Ethyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.20 (2.7H, t, J=7.1 Hz), 1.28 (0.3H, t, J=7.1 Hz), 4.14 (1.8H, q, J=7.1 Hz), 4.20 (1.8H, s), 4.25 (0.2H, q, J=7.1 Hz), 6.00 (0.1H, s), 7.74 (0.1H, s), 7.87-7.96 (2H, m), 8.09-8.19 (2H, m), 8.15 (0.9H, s), 11.90-12.10 (0.1H, br).

MS (ESI) m/z: 335 (M+Na)⁺.

Example 3 Phenyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.50 (1.8H, s), 6.22 (0.1H, s), 6.70-6.77 (0.2H, m), 7.13-7.20 (1.8H, m), 7.21-7.33 (1.2H, m), 7.39-7.47 (1.8H, m), 7.81 (0.1H, s), 7.88-7.96 (2H, m), 8.09-8.19 (2H, m), 8.23 (0.9H, s), 11.05-11.90 (0.1H, br).

MS (ESI) m/z: 383 (M+Na)⁺.

Example 4

Benzyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.29 (1.8H, s), 5.18 (1.8H, s), 5.28 (0.2H, s), 6.07 (0.1H, s), 7.26-7.46 (5H, m), 7.74 (0.1H, s), 7.87-7.97 (2H, m), 8.10-8.20 (2H, m), 8.15 (0.9H, s), 11.82-11.94 (0.1H, br).

MS (ESI) m/z: 397 (M+Na)⁺.

Example 5 2-Hydroxyethyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.52-3.70 (2H, m), 4.00-4.15 (2H, m), 4.22 (1.8H, s), 4.81 (1H, t, J=5.4 Hz), 6.01 (0.1H, s), 7.73 (0.1H, s), 7.88-7.96 (2H, m), 8.10-8.17 (2.9H, m), 11.83-12.02 (0.1H, br).

MS (ESI) m/z: 351 [M+Na]⁺

Example 6 4-Piperidyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate Hydrochloride (6a) tert-Butyl 4-[3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionyloxy]piperidine-1-carboxylate

According to Example 1, tert-butyl 4-[3-(4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionyloxy]piperidine-1-carboxylate was synthesized.

¹H-NMR (DMSO-d₅, 400 MHz) δ: 1.36 (8.1H, s), 1.40 (0.9H, s), 1.43-1.54 (2H, m), 1.72-1.83 (2H, m), 3.14-3.24 (2H, m), 3.43-3.53 (2H, m), 4.20 (1.8H, s), 4.88-4.97 (0.9H, m), 5.06-5.16 (0.1H, m), 6.01 (0.1H, s), 7.73 (0.1H, s), 7.87-7.96 (2H, m), 8.09-8.18 (2H, m), 8.14 (0.9H, s).

(6b) 4-Piperidyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate Hydrochloride

The compound of Example 6(6a) (302 mg, 0.643 mmol) was suspended in formic acid (3 mL), 8.3 M hydrogen chloride isopropanol solution (0.31 mL, 2.6 mmol) was added thereto at 0° C., and the mixture was stirred at the same temperature for 10 min. Ethyl acetate (15 mL) was added and the mixture was stirred at the same temperature for 1 hr. The precipitate was collected by filtration, and washed with ethanol (3 mL) to give 4-piperidyl 3-(4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate hydrochloride as a yellow powder (188 mg, yield 72%).

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.72-1.87 (2H, m), 1.94-2.09 (2H, m), 3.01-3.15 (4H, m), 4.25 (1.8H, s), 4.95-5.06 (0.9H, m), 5.06-5.16 (0.1H, m), 6.02 (0.1H, s), 7.72 (0.1H, s), 7.88-7.98 (2H, m), 8.10-8.20 (2H, m), 8.17 (0.9H, s), 8.60-8.98 (2.1H, br).

MS (ESI) m/z: 368 (M+H)⁺.

Example 7 2-Carboxyethyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate (7a) 2-Benzyloxycarbonylethyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

According to Example 1, 2-benzyloxycarbonylethyl 3-(4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate was synthesized.

¹H-NMR (CDCl₃, 400 MHz) δ: 2.73 (0.3H, t, J=6.1 Hz), 2.78 (1.7H, t, J=6.1 Hz), 3.98 (0.3H, s), 4.48 (0.3H, t, J=6.1 Hz), 4.53 (1.7H, t, J=6.1 Hz), 5.13 (0.3H, s), 5.18 (1.7H, s), 5.95 (0.85H, s), 7.25 (0.85H, s), 7.30-7.44 (5H, m), 7.65 (0.15H, s), 7.73-7.84 (2H, m), 8.16-8.29 (2H, m), 11.87 (0.85H, s).

(7b) 2-Carboxyethyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

The compound of Example 7(7a) (462 mg, 0.914 mmol) was dissolved in a mixed solution of methanol (40 mL) and tetrahydrofuran (16 mL), 10% Pd—C (64 mg) was added thereto and the mixture was subjected to catalytic hydrogenation at 0.2 MPa at room temperature for 20 min. Pd—C was filtered off, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (chloroform:methanol, 100:1, V/V) and the solvent in the object fraction was evaporated under reduced pressure. Ethyl acetate (8 mL) was added to the obtained powder, and the powder was collected by filtration to give 2-carboxyethyl 3-(4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate as a yellow powder (220 mg, yield 68%).

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.57 (1.8H, t, J=6.1 Hz), 2.67 (0.2H, t, J=6.1 Hz), 4.20 (1.8H, s), 4.27 (1.8H, t, J=6.1 Hz), 4.37 (0.2H, t, J=6.1 Hz), 5.98 (0.1H, s), 7.75 (0.1H, s), 7.87-7.97 (2H, m), 8.09-8.19 (2H, m), 8.13 (0.9H, s), 12.20-12.50 (1.1H, br).

MS (ESI) m/z: 379 (M+Na)⁺.

Example 8 2-Pyridylmethyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

According to Example 1, the title compound was synthesized.

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.35 (1.8H, s), 5.25 (1.8H, s), 5.35 (0.2H, s), 6.11 (0.1H, s), 7.30-7.39 (1H, m), 7.41-7.46 (0.9H, m), 7.46-7.51 (0.1H, m), 7.75 (0.1H, s), 7.78-7.88 (1H, m), 7.88-7.96 (2H, m), 8.10-8.18 (2H, m), 8.19 (0.9H, s), 8.51-8.56 (0.9H, m), 8.56-8.59 (0.1H, m).

MS (ESI) m/z: 398 (M+Na)⁺.

Example 9 4-Tetrahydropyranyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

According to Example 1, the title compound was synthesized.

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.48-1.60 (1.8H, m), 1.60-1.68 (0.2H, m), 1.80-1.89 ((1.8H, m), 1.89-1.98 (0.2H, m), 3.41-3.50 (2H, m), 3.68-3.79 (1.8H, m), 3.80-3.88 (0.2H, m), 4.21 (1.8H, s), 4.89-5.00 (0.9H, m), 5.01-5.11 (0.1H, m), 6.02 (0.1H, s), 7.74 (0.1H, s), 7.88-7.97 (2H, m), 8.10-8.19 (2H, m), 8.15 (0.9H, s), 11.70-12.10 (0.1H, br).

MS (ESI) m/z: 391 (M+Na)⁺.

Example 10 tert-Butyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

According to Example 1, the title compound was synthesized.

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.41 (5.4H, s), 1.52 (3.6H, s), 4.07 (1.2H, s), 5.91 (0.4H, s), 7.71 (0.4H, s), 7.86-7.97 (2H, m), 8.07-8.19 (2H, m), 8.10 (0.6H, s), 12.09 (0.4H, s).

MS (ESI) m/z: 363 (M+Na)⁺.

Example 11 2,2-Dimethyl[1,3]dioxolan-4-ylmethyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate (11a) 2-(2,2-Dimethyl-4,6-dioxo-[1,3]dioxane-5-carbonyl)naphtho[2,3-b]furan-4,9-dione

Meldrum's acid (2.00 g, 13.9 mmol) was dissolved in methylene chloride (60 mL), N,N-dimethylaminopyridine (3.00 g, 24.6 mmol) was added thereto and the mixture was cooled to −10° C. A solution of the compound of Example 1(1a) (3.23 g, 12.4 mmol) in methylene chloride (120 mL) was added dropwise at not more than −5° C. over 30 min, and the mixture was stirred at room temperature for 1.5 hr. The solvent was evaporated under reduced pressure, ethyl acetate was added to the obtained residue and the residue was collected by filtration. To the obtained powder was added chloroform (500 mL), and the mixture was washed successively with 1.5 M hydrochloric acid (150 mL), water (150 mL) and saturated brine (200 mL), and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. To the obtained residue was added diethyl ether and the residue was collected by filtration to give a yellow powder (3.93 g). The obtained powder (400 mg) was suspended in ethyl acetate (10 mL), and the suspension was heated to about 70° C. and stirred at room temperature for 30 min. The insoluble material was collected by filtration to give 2-(2,2-dimethyl-4,6-dioxo-[1,3]dioxane-5-carbonyl)naphtho[2,3-b]furan-4,9-dione as a yellow powder (350 mg).

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.61 (6H, s), 7.01 (1H, s), 7.83-7.93 (2H, m), 8.04-8.16 (2H, m).

(11b) 2,2-Dimethyl[1,3]dioxolan-4-ylmethyl 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate

The compound of Example 11(11a) (800 mg, 2.17 mmol) and 2,2-dimethyl-1,3-dioxolan-4-methanol (1.43 g, 10.8 mmol) were suspended in tetrahydrofuran (25 mL), and the suspension was stirred at 60° C. for 2 hr. The suspension was allowed to cool, water was added to the reaction mixture, and the mixture was extracted twice with methylene chloride. The organic layers were combined, washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the obtained residue was purified by column chromatography (ethyl acetate:chloroform, 0:10→10:90, V/V). The solvent in the object fraction was evaporated under reduced pressure to give a yellow powder (567 mg). To the obtained powder was added t-butyl methyl ether (10 mL), and the mixture was stirred at room temperature for 15 min. The insoluble material was collected by filtration. To the obtained powder was added t-butyl methyl ether (6 mL) again, and the insoluble material was collected by filtration to give 2,2-dimethyl[1,3]dioxolan-4-ylmethyl 3-(4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionate as a yellow powder (438 mg, yield 51%).

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.22-1.28 (6H, m), 3.63-3.80 (1H, m), 3.95-4.04 (1H, m), 4.05-4.13 (1H, m), 4.15-4.30 (3.8H, m), 6.02 (0.1H, s), 7.75 (0.1H, s), 7.87-7.95 (2H, m), 8.08-8.17 (2.9H, m), 11.70-11.90 (0.1H, br).

MS (ESI) m/z: 421 (M+Na)⁺.

Example 12 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionyloxymethyl 2,2-Dimethylpropionate (12a) Mono(2,2-dimethylpropionyloxymethyl)malonate

Monobenzyl malonate (2.00 g, 10.3 mmol), chloromethyl pivalate (1.55 g, 10.3 mmol), sodium iodide (1.54 g, 10.3 mmol) and potassium carbonate (1.71 g, 12.4 mmol) were suspended in N,N-dimethylformamide (20 mL), and the suspension was stirred at room temperature for 1.5 hr. Water was added to the reaction mixture, and the mixture was extracted twice with ethyl acetate. The organic layers were combined and washed twice with water and once with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the obtained residue was purified by column chromatography (n-hexane:ethyl acetate, 9:1→7:3, V/V). The solvent in the object fraction was evaporated under reduced pressure to give benzyl 2,2-dimethylpropionyloxymethyl malonate as a colorless oil (1.05 g, yield 33%).

¹H-NMR (CDCl₃, 400 MHz) δ: 1.16-1.21 (9H, m), 3.47 (2H, s), 5.12-5.18 (2H, m), 5.70-5.82 (2H, m), 7.28-7.40 (5H, m).

10% Pd—C (105 mg) was wetted with toluene (0.2 mL), a solution of benzyl 2,2-dimethylpropionyloxymethyl malonate (1.05 g, 3.41 mmol) in methanol (30 mL) was added, and the mixture was subjected to catalytic hydrogenation at 0.3 MPa at room temperature for 30 min. The insoluble material in the reaction mixture was filtered off through celite, the solvent in the filtrate was evaporated under reduced pressure and the residue was dissolved in ethyl acetate. The solvent was evaporated under reduced pressure to give mono(2,2-dimethylpropionyloxymethyl) malonate as a pale black oil (709 mg, yield 95%).

¹H-NMR (CDCl₃, 400 MHz) δ: 1.18-1.23 (9H, m), 3.48 (2H, s), 5.75-5.83 (2H, m).

(12b) 3-(4,9-Dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionyloxymethyl 2,2-Dimethylpropionate

The compound of Example 12(12a) (709 mg, 3.25 mmol) was dissolved in acetonitrile (8.5 mL), triethylamine (0.78 mL, 5.6 mmol) and then magnesium chloride (407 mg, 4.27 mmol) were added thereto under ice-cooling, and the mixture was stirred under a nitrogen stream at room temperature for 2.5 hr. To the obtained solution were added a solution of the compound of Example 1(1a) (446 mg, 1.71 mmol) in methylene chloride (17 mL) and then triethylamine (0.52 mL, 3.7 mmol) under ice-cooling, and the mixture was stirred at 60° C. for 30 min. Under ice-cooling, water was added to the reaction mixture, and the mixture was acidified with 6 M hydrochloric acid and extracted with ethyl acetate. The organic layer was washed with saturated brine, dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The obtained powder was purified by silica gel column chromatography (n-hexane:ethyl acetate, 6:4→ethyl acetate:chloroform, 25:75, V/V), and the solvent in the object fraction was evaporated under reduced pressure. To the obtained residue was added t-butylmethylether, and the residue was collected by filtration to give 3-(4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-oxo-propionyloxymethyl 2,2-dimethylpropionate as a yellow powder (358 mg, yield 53%).

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.12-1.18 (9H, m), 4.31 (1.8H, s), 5.75 (1.8H, m), 5.85 (0.2H, m), 5.99 (0.1H, s), 7.76 (0.1H, s), 7.87-7.96 (2H, m), 8.09-8.18 (2.9H, m), 11.52-11.77 (0.1H, br).

MS (ESI) m/z: 421 (M+Na)⁺.

Example 13 2-Hydroxyethyl 3-(4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-hydroxy-acrylate Ethanolamine Salt

The compound of Example 5 (1.00 g, 3.05 mmol) was suspended in ethyl acetate (150 mL), ethanolamine (1.84 mL, 30.5 mmol) was added thereto and the mixture was stirred at room temperature for 40 min. The insoluble material was collected by filtration, and washed successively with ethyl acetate and ethanol to give 2-hydroxyethyl 3-(4,9-dioxo-4,9-dihydro-naphtho[2,3-b]furan-2-yl)-3-hydroxy-acrylate ethanolamine salt as a red powder (1.13 g, yield 95%).

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.82 (2H, t, J=5.5 Hz), 3.51-3.59 (4H, m), 3.86-3.96 (2H, m), 4.05-4.30 (1H, br), 5.11 (1H, s), 7.05 (1H, s), 7.80-7.98 (2H, m), 8.03-8.18 (2H, m).

MS (ESI) m/z: 351 (M+Na)⁺.

Examples 14-154 shown in the following Table 1-1-Table 1-23 were synthesized according to Examples 1, 6, 7, 11, 12 and 13.

TABLE 1-1 Ex. No. structure data Ex. 14

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.60- 3.75 (2H, m), 4.20-4.38 (3.8H, m), 4.47 (1.8H, s), 4.54 (0.2H, s), 5.99-6.04 (0.1H, m), 7.18-7.36 (5H, m), 7.74-7.78 (0.1H, m), 7.89-7.96 (2H, m), 8.11-8.20 (2.9H, m), 11.87- 11.92 (0.1H, br). MS (ESI) m/z: 441 [M + Na]⁺ Ex. 15

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.23- 3.36 (2H, m), 3.59-3.77 (1H, m), 3.95-4.27 (3.8H, m), 4.43-5.26 (2H, br), 6.01 (0.1H, s), 7.73 (0.1H, s), 7.87-7.98 (2H, m), 8.08-8.18 (2.9H, m), 11.83-11.97 (0.1H, br). MS (ESI) m/z: 381[M + Na]⁺ Ex. 16

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.28- 3.40 (2H, m), 3.60-3.77 (1H, m), 3.95-4.02 (1H, m), 4.10-4.15 (1H, m), 4.21 (1.8H, s), 4.63 (1H, t, J = 5.6 Hz), 4.90 (1H, d, J = 5.1 Hz), 6.01 (0.1H, s), 7.73 (0.1H, s), 7.87-7.98 (2H, m), 8.09-8.19 (2.9H, m), 11.80-11.92 (0.1H, br). MS (ESI) m/z: 381 [M + Na]⁺ Ex. 17

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.28- 3.40 (2H, m), 3.60-3.77 (1H, m), 3.95-4.02 (1H, m), 4.10-4.15 (1H, m), 4.21 (1.8H, s), 4.62 (1H, t, J = 5.6 Hz), 4.90 (1H, d, J = 5.1 Hz), 6.01 (0.1H, s), 7.73 (0.1H, s), 7.87-7.98 (2H, m), 8.09-8.19 (2.9H, m), 11.80-12.00 (0.1H, br). MS (ESI) m/z: 381 [M + Na]⁺ Ex. 18

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.53 (3H, m), 3.64-3.85 (1H, m), 4.03- 4.16 (2H, m), 4.20 (1.8H, s), 4.40- 4.73 (3H, m), 5.99 (0.1H, s), 7.72 (0.1H, s), 7.86-7.98 (2H, m), 8.09- 8.18 (2.9H, m), 11.70-12.03 (0.1H, br). MS (ESI) m/z: 411 [M + Na]⁺ Ex. 19

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.77- 1.88 (1H, m), 3.32-3.56 (4H, m), 4.11 (2H, d, J = 5.9 Hz), 4.20 (1.8H, s), 4.36-4.67 (2H, br), 5.98 (0.1H, s), 7.70 (0.1H, s), 7.86-7.97 (2H, m), 8.07-8.19 (2.9H, m), 11.78-12.00 (0.1H, br). MS (ESI) m/z: 395 [M + Na]⁺ Ex. 20

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.31- 3.48 (6H, m), 4.02 (1.8H, s), 4.13-4.20 (2H, m), 4.27-4.63 (3H, m), 5.94 (0.1H, s), 7.67 (0.1H, s), 7.87-7.96 (2H, m), 8.09-8.18 (2.9H, m), 11.60-12.07 (0.1H, br). MS (ESI) m/z: 401 [M − H]⁻ Ex. 21

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.49- 3.64 (4H, m), 4.18-4.33 (3.8H, s), 5.36-5.54 (2H, br), 5.99 (0.1H, s), 7.63 (0.1H, s), 7.88-7.98 (2H, m), 8.00-8.23 (5.9H, m). MS (ESI) m/z: 388 [M + H]⁺ Ex. 22

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.38- 3.54 (1H, m), 3.64-3.78 (1H, m), 3.78-3.90 (1H, m), 3.92-4.02 (1H, m), 4.16-4.40 (2.8H, m), 5.10-5.25 (2H, m), 6.04 (0.1H, s), 7.72 (0.1H, s), 7.87-7.96 (2H, m), 8.09-8.17 (2.9H, m), 11.40- 12.20 (0.1H, br). MS (ESI) m/z: 393 [M + Na]⁺ Ex. 23

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.16 (2.7H, s), 2.21 (0.3H, s), 4.28 (1.8H, s), 5.06 (1.8H, s), 5.14 (0.2H, s), 6.01 (0.1H, s), 7.75 (0.1H, s), 7.88-7.96 (2H, m), 8.09-8.16 (2.9H, m), 11.60- 11.75 (0.1H, s). MS (ESI) m/z: 419 [M + Na]⁺ Ex. 24

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.40- 4.49 (7.8H, m), 5.07-5.19 (0.8H, m), 5.98-6.03 (0.2H, m), 7.67-7.72 (0.2H, m), 7.93-7.99 (2H, m), 8.12-8.25 (2.8H, m), 12.08 (0.2H, s). MS (ESI) m/z: 469 [M + Na]⁺ Ex. 25

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.38- 3.50 (2H, m), 3.59-3.77 (6H, m), 4.17 (0.4H, s), 4.82 (0.4H, s), 4.88 (1.6H, s), 6.13 (0.8H, s), 7.43 (0.8H, s), 7.73 (0.2H, s), 7.75-7.84 (2H, m), 8.16-8.27 (2H, m), 11.74-11.86 (0.8H, br). MS (ESI) m/z: 434 [M + Na]⁺ Ex. 26

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.38- 1.64 (6H, m), 3.27-3.40 (4H, m), 4.29 (1.7H, s), 4.86 (1.7H, s), 4.97 (0.3H, s), 6.06 (0.15H, s), 7.76 (0.15H, s), 7.88- 7.96 (2H, m), 8.09-8.22 (2.85H, m), 11.73-11.84 (0.15H, br). MS (ESI) m/z: 432 [M + Na]⁺ Ex. 27

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.70-3.84 (2H, m), 3.89-4.20 (1.8H, m), 4.94-5.08 (1H, m), 5.88-6.01 (0.1H, br), 7.63-7.71 (0.1 H, m), 7.86-7.97 (2H, m), 8.08-8.20 (2.9H, m). MS (ESI) m/z: 395 [M + Na]⁺ Ex. 28

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.76-3.94 (4H, m), 4.25-4.52 (5.8H, m), 5.32-5.47 (1H, m), 5.99 (0.1H, s), 7.73 (0.1H, s), 7.74-7.85 (2H, m), 8.18-8.28 (2.9H, m), 8.36-8.57 (6H, m), 11.45-11.92 (0.1H, br). Ex. 29

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.38-2.58 (8H, m), 4.13-4.34 (5.8H, m), 5.13-5.29 (1H, m), 6.01 (0.1H, s), 7.75 (0.1H, s), 7.87-7.97 (2H, m), 8.09-8.19 (2.9H, m), 11.68-11.78 (0.1H, br), 12.03-12.37 (2H, br). MS (ESI) m/z: 581 [M + Na]⁺ Ex. 30

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.97-2.09 (6H, m), 4.07-4.47 (6H, m), 5.10-5.27 (1H, m), 5.98 (0.1H, s), 7.73 (0.1H, s), 7.88- 7.96 (2H, m), 8.10-8.20 (2.9H, m), 11.70-11.80 (0.1H, br). MS (ESI) m/z: 465 [M + Na]⁺ Ex. 31

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.24-3.84 (7H, m), 4.00-4.20 (2H, m), 4.25 (1.8H, s), 6.03 (0.1H, s), 7.74 (0.1H, s), 7.87- 7.96 (2H, m), 8.09-8.17 (2.9H, m), 11.71-11.88 (0.1H, br). MS (ESI) m/z: 407 [M + Na]⁺ Ex. 32

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.12 (5.4H, s), 1.22 (0.6H, s), 3.57 (2.7H, s), 3.64 (0.3H, s), 4.13 (1.8H, m), 4.20-4.24 (2H, m), 5.98 (0.1H, s), 7.73 (0.1H, s), 7.87-7.96 (2H, m), 8.09-8.18 (2.9H, m), 11.75-11.88 (0.1H, br). MS (ESI) m/z: 421 [M + Na]⁺ Ex. 33

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.09 (5.4H, s), 1.19 (0.6H, s), 4.10 (1.8H, s), 4.21 (2H, s), 6.00 (0.1H, s), 7.74 (0.1H, s), 7.87-7.96 (2H, m), 8.09-8.17 (2.9H, m), 12.29-12.44 (0.1H, br). MS (ESI) m/z: 407 [M + Na]⁺ Ex. 34

¹H-NMR (DMSO-d₆ + TFA, 400 MHz) δ: 4.19-4.32 (1.8H, m), 4.35-4.52 (2H, m), 4.54-4.63 (1H, m,), 5.96 (0.1H, s), 7.66 (0.1H, s), 7.86-7.97 (2H, m), 8.09-8.20 (2.9H, m), 8.42-8.57 (3H, br). MS (ESI) m/z: 372 [M + H]⁺ Ex. 35

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.11-1.29 (14H, m), 1.40-1.58 (4H, m), 2.16 (2H, t, J = 7.3 Hz), 4.08 (2H, t, J = 6.3 Hz), 4.19 (1.8H, s), 5.99 (0.1H, s), 7.72 (0.1H, s), 7.87-7.98 (2H, m), 8.09-8.17 (2.9H, m), 11.83- 12.07 (0.1H, s). MS (ESI) m/z: 505 [M + Na]⁺ Ex. 36

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.24-1.42 (2H, m), 1.43-1.71 (4H, m), 2.13-2.26 (2H, m), 4.01-4.13 (2H, m), 4.21 (1.8H, s), 5.99 (0.1H, s), 7.72 (0.1H, s), 7.87-7.95 (2H, m), 8.09- 8.17 (2.9H, m), 11.92-12.00 (1.1H, m). MS (ESI) m/z: 421 [M + H]⁺ Ex. 37

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.10-4.63 (1H, br), 4.96-5.48 (2.5H, br), 7.03-7.28 (0.5H, br), 7.38-7.56 (2H, br), 7.75- 8.03 (4H, br), 8.03-8.23 (2.9H, br). MS (ESI) m/z: 441 [M + Na]⁺ Ex. 38

¹H-NMR (D₂O, 400 MHz) δ: 1.19 (6H, s), 3.36 (2H, s), 3.65- 3.77 (8H, m), 4.21 (2H, s), 7.82-7.84 (3H, m), 8.01-8.08 (2H, m). MS (ESI) m/z: 439 [M + H]⁺ Ex. 39

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.77 (4.8H, s), 0.94 (1.2H, s), 2.04 (1.6H, s), 2.23-2.42 (8H, m), 2.75-3.00 (2.4H, m), 3.80-3.94 (2H, m), 4.22 (1.6H, m), 5.03- 5.20 (2H, m), 5.55 (0.2H, s), 5.64-5.78 (1H, m), 7.46 (0.2H, s), 7.88-7.98 (2H, m), 8.11-8.20 (2.8H, m). MS (ESI) m/z: 479 [M + H]⁺ Ex. 40

¹H-NMR (D₂O, 400 MHz) δ: 2.17-2.28 (2H, m), 3.36-3.44 (2H, m), 3.56- 3.74 (8H, m), 4.32-4.39 (2H, m), 7.81-7.89 (3H, m), 8.01-8.15 (2H, m). MS (ESI) m/z: 411 [M + H]⁺ Ex. 41

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.09 (5.4H, s), 1.16 (0.6H, s), 3.08- 3.27 (4H, m), 3.83-4.04 (4H, m), 4.09 (1.8H, s), 4.16 (0.2H, s), 4.31 (1.8H, s), 6.06 (0.1H, s), 7.68 (0.1H, s), 7.89-7.97 (2H, m), 8.11-8.19 (2H, m), 8.21 (0.9H, s), 9.69-9.94 (1H, br), 11.69-11.87 (0.1H, br). MS (ESI) m/z: 440 [M + H]⁺ Ex. 42

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.89- 1.00 (6H, m), 2.37-2.47 (4H, m), 3.40-3.50 (2H, m), 4.28 (1.8H, s), 4.81 (1.8H, s), 5.08 (0.2H, s), 5.78 (0.1H, s), 7.60 (0.1H, s), 7.85-7.98 (2H, m), 8.08-8.23 (2.9H, m). MS (ESI) m/z: 408 [M + H]⁺ Ex. 43

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.80- 2.98 (1.8H, m), 3.00-3.07 (0.2H, m), 4.04-4.17 (3H, m), 4.25 (1.8H, s), 4.39-4.48 (1.8H, m), 4.51-4.56 (0.2H, m), 6.05 (0.1H, s), 6.78-6.87 (1.8H, m), 6.93- 6.98 (0.2H, m), 7.03-7.09 (1.8H, m), 7.15-7.20 (0.2H, m), 7.76 (0.1H, s), 7.87-7.95 (2H, m), 7.99-8.42 (6H, m), 12.99-14.66 (1H, br). MS (ESI) m/z: 492 [M + H]⁺ Ex. 44

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.20 (9H, s), 3.30-3.37 (2H, m), 3.78- 3.87 (2H, m), 4.74-4.85 (2H, m), 7.88-7.96 (3H, m), 8.10-8.20 (2H, m). Ex. 45

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.08- 2.10 (3H, m), 4.30 (1.7H, s), 5.73- 5.81 (2H, m), 5.98 (0.15H, m), 7.89-7.95 (2H, m), 8.11-8.18 (3H, m). MS (ESI) m/z: 379 [M + Na]⁺ Ex. 46

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.44 (2.7H, d, J = 5.4 Hz), 1.50 (0.3H, d, J = 5.4 Hz), 2.04 (2.7H, s), 2.07 (0.3H, s), 4.20-4.32 (1.8H, m), 5.97 (0.1H, s), 6.79 (0.9H, q, J = 5.4 Hz), 6.87-6.93 (0.1H, m), 7.75 (0.1H, s), 7.87-7.95 (2H, m), 8.08-8.17 (2.9H, m), 11.58-11.83 (0.1H, br). MS (ESI) m/z: 393 [M + Na]⁺ Ex. 47

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.02- 1.12 (6H, s), 1.44 (2.7H, d, J = 5.4 Hz), 1.50 (0.3H, d, J = 5.2 Hz), 2.52-2.64 (1H, m), 4.21-4.33 (1.8H, m), 5.98 (0.1H, s), 6.75-6.94 (1H, m), 7.77 (0.1H, s), 7.87-7.96 (2H, m), 8.08-8.18 (2.9H, m), 11.53- 11. 86 (0.1H, br). MS (ESI) m/z: 421 [M + Na]⁺ Ex. 48

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.09- 1.18 (9H, m), 1.38-1.54 (3H, s), 4.27 (1.8H, m), 5.97 (0.1H, s), 6.76 (0.9H, q, J = 5.4 Hz), 6.88 (0.1H, q, J = 5.4 Hz), 7.76 (0.1H, s), 7.87-7.96 (2H, m), 8.08-8.20 (2.9H, m), 11.55-11.82 (0.1H, br). MS (ESI) m/z: 435 [M + Na]⁺ Ex. 49

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.75- 0.88 (6H, m), 1.41-1.55 (7H, m), 2.12-2.25 (1H, m), 4.20-4.31 (1.76H, m), 5.95 (0.12H, s), 6.83 (0.88H, q, J = 5.4 Hz), 6.95 (0.12H, q, J = 5.4 Hz), 7.76 (0.12H, s), 7.87-7.95 (2H, m), 8.09-8.17 (2.88H, m), 11.56-11.85 (0.12H, br). MS (ESI) m/z: 449 [M + Na]⁺ Ex. 50

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.26- 1.33 (6H, m), 4.33 (1.8H, s), 5.43- 5.52 (1H, m), 5.78 (1.8H, s), 5.88 (0.2H, s), 5.99 (0.1H, s), 7.78 (0.1H, s), 7.75-7.85 (2H, m), 8.17- 8.30 (2.9H, m), 11.60-11.75 (0.1H, br). MS (ESI) m/z: 423 [M + Na]⁺ Ex. 51

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.06- 1.09 (6H, m), 3.36-3.44 (2H, s), 4.30 (1.8H, s), 4.89 (1H, t, J = 5.4Hz), 5.74 (1.8H, s), 5.83 (0.2H, s), 5.96 (0.1H, s), 7.88- 7.96 (2H, m), 8.11-8.18 (3H, m). MS (ESI) m/z: 437 [M + Na]⁺ Ex. 52

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.11- 1.21 (6H, m), 1.95-2.04 (3H, m), 3.98-4.07 (2H, m), 4.32 (1.7H, s), 5.77 (1.7H, s), 5.86 (0.3H, s), 6.00 (0.15H, s), 7.45 (0.15H, s), 7.75-7.84 (2H, m), 8.17-8.27 (2.85H, m), 11.58-11.78 (0.15H, br). MS (ESI) m/z: 479 [M + Na]⁺ Ex. 53

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.13 (5H, s), 1.17 (1H, m), 1.40-1.52 (3H, m), 1.97 (2.5H, s), 2.00 (0.5H, 3), 3.95-4.08 (2H, m), 4.27 (1.8H, m), 5.95 (0.1H, s), 6.78 (0.8H, q, J = 5.4 Hz), 6.90 (0.2H, q, J = 5.4 Hz), 7.75 (0.1H, s), 7.88-7.97 (2H, m), 8.10-8.19 (2.9H, m), 11.60-11.75 (0.1H, s). MS (ESI) m/z: 493 [M + Na]⁺ Ex. 54

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.03- 1.14 (6H, m), 1.37-1.52 (3H, m), 3.18-3.30 (5H, m), 4.28-4.32 (1.8H, m), 5.98 (0.1H, s), 6.72- 6.81 (0.9H, m), 6.83-6.94 (0.1H, m), 7.78 (0.1H, s), 7.87-7.96 (2H, m), 8.09-8.18 (2.9H, m), 11.60-11.80 (0.1H, br). MS (ESI) m/z: 465 [M + Na]⁺ Ex. 55

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.08- 1.85 (13H, m), 2.23-2.38 (1H, m), 4.18-4.29 (1.7H, m), 5.95 (0.15H, s), 6.73-6.94 (1H, m), 7.74 (0.15H, s), 7.85-7.95 (2H, m), 8.07-8.17 (2.85H, m), 11.49-11.82 (0.15H, br). MS (ESI) m/z: 461 [M + Na]⁺ Ex. 56

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.49- 1.65 (2H, m), 1.70-1.83 (2H, m), 2.60-2.75 (1H, m), 3.28-3.41 (2H, m), 3.73-3.86 (2H, m), 4.32 (1.8H, s), 5.77 (1.8H, s), 5.86 (0.2H, s), 6.00 (0.1H, s), 7.78 (0.1H, s), 7.88-8.02 (2H, m), 8.09-8.22 (2.9H, m), 11.59-11.75 (0.1H, br). MS (ESI) m/z: 449 [M + Na]⁺ Ex. 57

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.40- 1.60 (5H, m), 1.66-1.78 (2H, m), 2.55-2.70 (1H, m), 3.25-3.37 (2H, m), 3.70-3.85 (2H, m), 4.27 (1.8H, s), 5.97 (0.1H, s), 6.80 (0.9H, q, J = 5.4 Hz), 6.91 (0.1H, q, J = 5.4 Hz), 7.77 (0.1H, s), 7.87-7.96 (2H, m), 8.08- 8.20 (2.9H, m), 11.60-11.75 (0.1H, br). MS (ESI) m/z: 463 [M + Na]⁺ Ex. 58

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.40- 1.67 (5H, m), 1.40-1.67 (6H, m), 2.53-2.64 (1H, m), 4.27 (1.8H, s), 5.95 (0.1H, s), 6.80 (0.9H, d, J = 5.4 Hz), 6.91 (0.1H, d, J = 5.4 Hz), 7.75 (0.1H, s), 7.88-7.96 (2H, m), 8.08- 8.20 (2.9H, m), 12.24-12.32 (0.1H, br). MS (ESI) m/z: 497 [M + Na]⁺ Ex. 59

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.85- 1.00 (6H, m), 1.43-1.60 (2H, m), 1.63-1.80 (2H, m), 1.92-2.04 (1H, m), 2.57-2.69 (1H, m), 3.25-3.40 (2H, m), 3.68-3.82 (2H, m), 4.22-4.35 (1.8H, m), 5.96 (0.1H, s), 6.57 (0.9H, d, J = 5.1 Hz), 6.69 (0.1H, d, J = 5.1 Hz), 7.73 (0.1H, s), 7.85-7.96 (2H, m), 8.08-8.20 (2.9H, m), 11.50-11.80 (0.1H, br). MS (ESI) m/z: 491 [M + Na]⁺ Ex. 60

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.50- 3.62 (2H, m), 4.07-4.17 (1H, m), 4.31 (1.7H, s), 4.84-4.95 (1H, br), 5.57 (1H, d, J = 6.1 Hz), 5.74-5.82 (1.7H, m), 5.84-5.92 (0.3H, m), 5.99 (0.15H, s), 7.78 (0.15H, s), 7.87-7.97 (2H, m), 8.08-8.20 (2.85H, m), 11.60-11.75 (0.15H, br). MS (ESI) m/z: 425 [M + Na]⁺ Ex. 61

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.65- 1.80 (2H, m), 1.92-2.03 (2H, m), 2.70-2.82 (1H, m), 2.87-3.02 (2H, m), 3.08-3.26 (2H, m), 4.34 (1.8H, s), 5.78 (1.8H, s), 5.87 (0.2H, s), 5.99 (0.1H, m), 7.79 (0.1H, s), 7.88-7.98 (2H, m), 8.09-8.20 (2.9H, m), 8.53- 8.70 (1H, br), 8.80-8.95 (1H, br), 11.47-11.89 (0.1H, br). MS (ESI) m/z: 426 [M + H]⁺ Ex. 62

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.17- 1.24 (3H, m), 1.46-1.54 (3H, m), 4.10-4.22 (2H, m), 4.25-4.34 (1.8H, m), 5.88-5.94 (0.1H, br), 6.65-6.81 (1H, m), 7.69-7.74 (0.1H, br), 7.88- 7.97 (2H, m), 8.09-8.18 (2.9H, m). MS (ESI) m/z: 423 [M + Na]⁺ Ex. 63

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.19- 1.26 (3H, m), 4.13-4.23 (2H, m), 4.34 (1.8H, s), 5.73 (1.8H, s), 5.84 (0.2H, s), 6.01 (0.1H, s), 7.78 (0.1H, s), 7.87-7.97 (2H, m), 8.08-8.19 (2.9H, m), 11.53- 11.77 (0.1H, br). MS (ESI) m/z: 409 [M + Na]⁺ Ex. 64

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.27- 3.40 (2H, m), 3.62-3.72 (1H, m), 3.98-4.07 (1H, m), 4.14-4.23 (1H, m), 4.19-4.27 (1.6H, m), 4.84- 4.94 (1H, br), 5.52-5.62 (1H, br), 5.76 (1.6H, s), 5.85 (0.4H, s), 6.00 (0.2H, s), 7.78 (0.2H, s), 7.87-7.97 (2H, m), 8.09-8.20 (2.8H, m), 11.50-11.82 (0.2H, br). MS (ESI) m/z: 455 [M + Na]⁺ Ex. 65

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.42- 1.56 (3H, m), 3.20-3.40 (2H, s), 3.59-3.71 (1H, m), 3.92-4.07 (1H, m), 4.09-4.20 (1H, m), 4.24-4.36 (1.8H, m), 4.61-4.75 (1H, br), 4.95-5.05 (1H, br), 5.98 (0.1H, m), 6.65-6.85 (1H, m), 7.76 (0.1H, s), 7.87-7.97 (2H, m), 8.09-8.19 (2.9H, m), 11.20-11.66 (0.1H, br). MS (ESI) m/z: 469 [M + Na]⁺ Ex. 66

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.22- 1.33 (6H, m), 1.48 (2.55H, d, J = 5.4 Hz), 1.54 (0.45H, d, J = 5.1 Hz), 3.61-3.71 (1H, m), 3.97-4.13 (2H, m), 4.16-4.35 (3.7H, m), 5.97-6.01 (0.15H, m), 6.70 (0.85H, q, J = 5.4 Hz), 6.78-6.85 (0.15H, m), 7.77 (0.15H, s), 7.88-7.96 (2H, m), 8.09-8.18 (2.85H, m), 11.52-11.83 (0.15H, br). MS (ESI) m/z: 509 [M + Na]⁺ Ex. 67

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.12- 1.40 (6H, m), 1.46 (2.7H, d, J = 5.1 Hz), 1.53 (0.3H, d, J = 5.4 Hz), 1.56-1.67 (2H, m), 1.75-1.90 (2H, m), 4.21-4.33 (1.8H, m), 4.46-4.62 (1H, m), 5.99 (0.1H, m), 6.82 (0.9H, q, J = 5.1 Hz), 6.75-6.83 (0.1H, m), 7.77 (0.1H, s), 7.88-7.96 (2H, m), 8.07-8.17 (2.9H, m), 11.60-11.75 (0.1H, br). MS (ESI) m/z: 477 [M + Na]⁺ Ex. 68

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.43-1.62 (5H, m), 1.81-1.95 (2H, m), 3.35-3.48 (2H, m), 3.68-3.80 (2H, m), 4.25 (0.9H, d, J = 16.6 Hz), 4.30 (0.9H, d, J = 16.6 Hz), 4.64-4.84 (1H, m), 5.99 (0.1H, s), 6.69 (0.9H, q, J = 5.4 Hz), 6.80 (0.1H, q, J = 5.4 Hz), 7.77 (0.1H, s), 7.85-7.97 (2H, m), 8.07-8.20 (2.9H, m), 11.60-11.75 (0.1H, br). MS (ESI) m/z: 479 [M + Na]⁺ Ex. 69

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.48-3.63 (2H, m), 4.00-4.12 (1H, m), 4.20-4.45 (5.8H, m), 4.60-5.00 (1H, br), 5.10-5.60 (1H, br), 6.00 (0.1H, s), 7.74 (0.1H, s), 7.75-7.84 (2H, m), 8.17-8.26 (2.9H, m), 11.74-11.86 (0.1H, br). MS (ESI) m/z: 439 [M + Na]⁺ Ex. 70

¹H-NMR (acetone-d₆ + D₂O, 400 MHz) δ: 3.25-3.46 (3H, m), 3.53-4.20 (6H, m), 4.28-4.79 (2.5H, m), 4.81-4.85 (0.5H, m), 5.95-6.01 (0.5H, s), 7.49-7.53 (0.5H, m), 7.66-7.96 (2.5H, m), 8.13-8.24 (2H, m). MS (ESI) m/z: 513 [M + Na]⁺ Ex. 71

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.37 (18H, s), 3.97-4.06 (1.8H, m), 4.08-4.15 (0.2H, m), 4.22 (1.9H, s), 4.25-4.30 (1.8H, m), 4.34- 4.41 (0.2H, m), 5.95 (0.1H, s), 7.86-7.95 (2H, m), 8.08-8.18 (3H, m). MS (ESI) m/z: 543 [M + Na]⁺ Ex. 72

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.33-1.64 (4H, m), 1.75-1.87 (2H, m), 2.72-2.82 (2H, m), 3.96-4.05 (1H, m), 4.27 (1.8H, s), 4.33-4.43 (4H, m), 5.86 (0.1H, s), 7.67 (0.1H, s), 7.80- 8.75 (10.9H, m), 11.77-11.83 (0.1H, br). MS (ESI) m/z: 457 [M + H]⁺ Ex. 73

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.92-1.03 (6H, m), 2.08-2.22 (1H, m), 3.92 (0.9H, m), 3.97 (0.1H, m), 4.23 (1.8H, s), 4.31- 4.60 (4H, m), 5.93 (0.1H, s), 7.74 (0.1H, s), 7.88-7.96 (2H, m), 8.10-8.19 (2.9H, m), 8.24- 8.60 (3H, br), 11.83-12.02 (0.1H, br). MS (ESI) m/z: 428 [M + H]⁺ Ex. 74

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.38- 1.46 (3H, m), 4.02-4.15 (1H, m), 4.27 (1.8H, s), 4.31-4.50 (4H, m), 5.98 (0.1H, s), 7.74 (0.1H, s), 7.88-7.96 (2H, m), 8.09-8.19 (2.9H, m), 8.42-8.73 (3H, br). MS (ESI) m/z: 400 [M + H]⁺ Ex. 75

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.75- 3.88 (2H, m), 4.10-4.21 (1H, m), 4.25 (1.8H, s), 4.30-4.50 (4H, m), 5.53-5.62 (1H, br), 5.98 (0.1H, s), 7.74 (0.1H, s), 7.75- 7.84 (2H, m), 8.17-8.27 (2.9H, m), 8.30-8.60 (3H, br). MS (ESI) m/z: 416 [M + H]⁺ Ex. 76

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.77- 0.88 (6H, m), 1.44-1.63 (7H, m), 4.22-4.34 (1.8H, m), 4.44-4.57 (1H, m), 5.99 (0.1H, s), 6.69 (0.9H, q, J = 5.4 Hz), 6.76-6.82 (0.1H, m), 7.77 (0.1H, s), 7.88- 7.95 (2H, m), 8.09-8.18 (2.9H, m), 11.59-11.87 (0.1H, br). MS (ESI) m/z: 465 [M + Na]⁺ Ex. 77

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.77- 0.92 (3H, m), 1.16-1.41 (6H, m), 1.49-1.71 (2H, m), 4.09 (2H, t, J = 6.4 Hz), 4.21 (1.8H, m), 6.01 (0.1H, s), 7.74 (0.1H, s), 7.88- 7.97 (2H, m), 8.09-8.18 (2.9H, m), 11.93-12.02 (0.1H, br). MS (ESI) m/z: 391 [M + Na]⁺ Ex. 78

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.15- 1.49 (6H, m), 1.56-1.93 (4H, m), 4.18 (1.8H, m), 4.70-4.90 (1H, m), 6.00 (0.1H, s), 7.74 (0.1H, s), 7.87-7.96 (2H, m), 8.09-8.18 (2.9H, m), 12.04-12.10 (0.1H, br). MS (ESI) m/z: 389 [M + Na]⁺ Ex. 79

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.24 (2.7H, s), 3.29 (0.3H, s), 3.50- 3.55 (1.8H, m), 3.58-3.63 (0.2H, m), 4.20-4.25 (3.6H, m), 4.30- 4.35 (0.2H, m), 6.04 (0.1H, s), 7.76 (0.1H, s), 7.88-7.95 (2H, m), 8.09-8.17 (2.9H, m), 11.84- 11.98 (0.1H, br). MS (ESI) m/z: 365 [M + Na]⁺ Ex. 80

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.86 (6H, s), 3.30-3.37 (2H, m), 3.48- 3.58 (2H, m), 4.64-4.73 (2H, m), 7.89-7.97 (2H, m), 8.10-8.20 (3H, m), 10.39-10.56 (1H, br). MS (ESI) m/z: 355 [M + H]⁺ Ex. 81

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.20 (2.7H, t, J = 7.1 Hz), 1.28 (0.3H, t, J = 7.1 Hz), 4.14 (1.7H, q, J = 7.1 Hz), 4.20 (1.8H, s), 4.25 (0.2H, q, J = 7.1Hz), 6.01 (0.1H, s), 7.77 (0.1H, s), 7.99-8.07 (1H, m), 8.08- 8.23 (2.9H, m). MS (ESI) m/z: 393 [M + H]⁺ Ex. 82

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.20 (2.7H, t, J = 7.1 Hz), 1.27 (0.3H, t, J = 7.1 Hz), 4.10-4.28 (3.8H, m), 4.42 (4H, s), 5.97 (0.1H, s), 7.46- 7.55 (2H, m), 7.68 (0.1H, s), 8.10 (0.9H, s). MS (ESI) m/z: 493 [M + Na]⁺ Ex. 83

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.82- 0.96 (6H, m), 1.73-1.90 (1H, m), 3.62 (2H, d, J = 6.6 Hz), 5.01 (1H, s), 6.99 (1H, s), 7.80-7.93 (2H, m), 8.03-8.17 (2H, s). MS (ESI) m/z: 363 [M + Na]⁺ Ex. 84

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.03 (2.7H, s), 1.04 (0.3H, s), 1.08 (0.3H, s), 1.43 (2.7H, d, J = 5.4 Hz), 1.49 (0.3H, d, J = 5.4 Hz), 3.29-3.44 (2H, m), 4.21-4.31 (1.8H, m), 4.84 (1H, t, J = 5.4 Hz), 5.94 (0.1H, s), 6.76 (0.9H, q, J = 5.4 Hz), 6.96 (0.1H, q, J = 5.4 Hz), 7.74 (0.1H, s), 7.87-7.97 (2H, m), 8.10- 8.18 (2.9H, m), 11.65-11.80 (0.1H, br). MS (ESI) m/z: 451 [M + Na]⁺ Ex. 85

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.27- 1.39 (2H, m), 1.45-1.60 (4H, m), 2.20 (2H, t, J = 7.3 Hz), 3.80-3.93 (2H, br), 5.10 (1H, s), 7.06 (1H, s), 7.82-7.90 (2H, m), 8.03-8.13 (2H, m), 9.50-14.63 (1H, m). MS (ESI) m/z: 419 [M − H]⁻ Ex. 86

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.23- 3.48 (2H, m), 3.55-3.67 (1H, m), 3.72-3.93 (2H, m), 4.68-5.05 (3H, m), 6.96-7.04 (1H, br), 7.78-7.93 (2H, m), 8.00-8.16 (2H, m). MS (ESI) m/z: 381 [M + Na]⁺ Ex. 87

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.16 (3H, t, J = 7.0 Hz), 3.93 (2H, q, J = 7.0 H), 5.11 (1H, s), 7.06 (1H, s), 7.80-7.91 (2H, m), 8.03-8.12 (2H, m). MS (ESI) m/z: 335 [M + Na]⁺ Ex. 88

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.35- 3.41 (2H, m), 3.57-3.66 (1H, m), 3.81-3.90 (2H, m), 4.66-4.86 (2H, br), 5.11 (1H, s), 7.06 (1H, s), 7.76-7.95 (2H, m), 8.02-8.16 (2H, m). MS (ESI) m/z: 381 [M + Na]⁺ Ex. 89

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.27 (3H, s), 3.47-3.53 (2H, m), 3.98- 4.06 (2H, m), 5.12 (1H, s), 7.08 (1H, s), 7.88-7.95 (2H, m), 8.01- 8.17 (2H, m). MS (ESI) m/z: 365 [M + Na]⁺ Ex. 90

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.22- 4.63 (5.8H, m), 4.99-5.15 (1H, m), 6.02 (0.1H, s), 7.78 (0.1H, s), 7.88-7.96 (2H, m), 8.09-8.20 (2.9H, m), 11.66-11.78 (0.1H, br). MS (ESI) m/z: 407 [M + Na]⁺ Ex. 91

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.21- 1.27 (3H, m), 4.17-4.28 (3.8H, m), 4.48-4.61 (3H, m), 5.91 (0.1H, s), 7.69 (0.1H, s), 7.90-7.96 (2H, m), 8.11-8.20 (2.9H, m), 8.55-9.10 (3H, br). MS (ESI) m/z: 400 [M + H]⁺ Ex. 92

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.07 (2.7H, t, J = 7.1 Hz), 1.12 (0.3H, t, J = 7.1 Hz), 3.42 (1.8H, q, J = 7.1 Hz), 3.49 (0.2H, q, J = 7.1 Hz), 3.52-3.58 (1.8H, m), 3.60-3.65 (0.2H, m), 4.17-4.25 (3.6H, m), 4.29-4.34 (0.2H, m), 6.04 (0.1H, s), 7.76 (0.1H, s), 7.87-7.95 (2H, m), 8.10-8.18 (2.9H, m), 11.85- 11.95 (0.1H, br). MS (ESI) m/z: 379 [M + Na]⁺ Ex. 93

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.24 (6H, t, J = 7.12 Hz), 3.02-3.25 (4H, m), 4.14-4.22 (2H, m), 4.32 (1.8H, s), 4.92 (1.8H, s), 5.01 (0.2H, s), 6.02 (0.1H, s), 7.79 (0.1H, s), 7.89-7.98 (2H, m), 8.10-8.22 (2.9H, m), 10.70-11.30 (1H, br). MS (ESI) m/z: 408 [M + H]⁺ Ex. 94

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.80- 2.85 (2H, m), 3.27 (3H, s), 3.46-3.58 (4H, m), 3.95-4.03 (1.6H, m), 4.17- 4.28 (0.4H, m), 5.00-5.15 (2H, m), 7.00-7.40 (3H, m), 7.82-7.97 (2H, m), 8.05-8.18 (2H, m). MS (ESI) m/z: 365 [M + Na]⁺ Ex. 95

¹H-NMR (D₂O, 400 MHz) δ: 2.94-3.02 (2H, m), 3.49-3.63 (2H, m), 3.63- 3.71 (2H, m), 3.85-4.08 (3H, m), 6.80-6.88 (1H, m), 7.51-7.64 (1H, m), 7.70-7.82 (1H, m). MS (ESI) m/z: 381 [M + Na]⁺ Ex. 96

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.00 (2.7H, s), 2.05 (0.3H, s), 4.19-4.21 (2H, m), 4.24 (1.8H, m), 4.28-4.32 (2H, m), 6.02 (0.1H, s), 7.76 (0.1H, s), 7.90-7.95 (2H, m), 8.13-8.16 (2.9H, m), 11.81 (0.1H, s). MS (ESI) m/z: 393 [M + Na]⁺ Ex. 97

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.37- 2.45 (4H, m), 3.28-3.31 (2H, m), 3.52-3.60 (4H, m), 4.29 (1.8H, s), 4.82-4.84 (1.8H, m), 4.90-4.94 (0.2H, m), 6.01 (0.1H, s), 7.75 (0.1H, s), 7.89-7.95 (2H, m), 8.10- 8.19 (2.9H, m). MS (ESI) m/z: 422 [M + H]⁺ Ex. 98

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.07 (2H, d, J = 5.4 Hz), 4.32 (1.6H, m), 5.45-5.55 (1H, m), 5.76-5.91 (2.2H, m), 7.75 (0.2H, s), 7.85-7.97 (2H, m), 8.07-8.22 (2.8H, m). MS (ESI) m/z: 395 [M + Na]⁺ Ex. 99

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.80 (5.4H, s), 0.93 (0.6H, s), 2.05 (1.8H, s), 2.31-2.41 (3.8H, m), 2.56-2.62 (0.4H, m), 3.46-3.53 (3.6H, m), 3.60-3.66 (0.4H, m), 3.88 (1.8H, s), 3.97 (0.2H, s), 4.23 (1.8H, s), 5.82 (0.1H, s), 7.61 (0.1H, s), 7.88-7.98 (2H, m), 8.10- 8.22 (2.9H, m). MS (ESI) m/z: 440 [M + H]⁺ Ex. 100

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.34 (1.8H, s), 6.00 (1.8H, s), 6.03 (0.1H, s), 6.10 (0.2H, 3), 7.45- 7.51 (1.8H, m), 7.54-7.59 (0.2H, m), 7.60-7.65 (0.9H, m), 7.68-7.74 (0.1H, m), 7.78 (0.1H, s), 7.88- 8.02 (4H, m), 8.09-8.15 (2.9H, m), 11.61-11.74 (0.1H, br). MS (ESI) m/z: 441 [M + Na]⁺ Ex. 101

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.10, 1.12 (total 6H, s, s), 3.20, 3.20 (total 3H, s, s), 4.31 (1.8H, s), 5.75 (1.8H, s), 5.84 (0.2H, s), 5.99 (0.1H, s), 7.78 (0.1H, s), 7.88-7.96 (2H, m), 8.11-8.18 (2.9H, m), 11.50-11.90 (0.1H, br). MS (ESI) m/z: 451 [M + Na]⁺ Ex. 102

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.48- 2.55 (2H, m), 3.60-3.67 (2H, m), 4.31 (1.8H, s), 5.75 (1.8H, s), 5.85 (0.1H, s), 6.00 (0.1H, s), 7.79 (0.1H, s), 7.88-7.95 (2H, m), 8.09-8.17 (2.9H, m), 11.61-11.74 (0.1H, br). MS (ESI) m/z: 409 [M + Na]⁺ Ex. 103

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.45 (2.4H, d, J = 5.4 Hz), 1.51 (0.6H, d, J = 5.4 Hz), 3.95-4.10 (2H, m), 4.21-4.32 (1.6H, m), 5.46 (1H, d, J = 6.4 Hz), 5.97 (0.2H, s), 6.85 (0.8H, q, J = 5.4 Hz), 6.96 (0.1H, q, J = 5.4 Hz), 7.77 (0.2H, s), 7.88-7.96 (2H, m), 8.10-8.19 (2.8H, m), 11.65-11.97 (0.1H, br). MS (ESI) m/z: 409 [M + Na]⁺ Ex. 104

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.19 (3H, s), 1.21 (3H, s), 1.37 (3H, d, J = 7.1Hz), 4.07-4.17 (2H, m), 4.27-4.30 (1H, m), 4.33 (1.8H, s), 5.78 (1.8H, s), 5.85-5.90 (0.3H, m), 7.66-7.78 (0.1H, m), 7.88-7.98 (2H, m), 8.12-8.20 (2.9H, m), 8.30-8.45 (3H, m). MS (ESI) m/z: 486 [M + H]⁺ Ex. 105

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.39- 3.53 (4H, m), 3.59-3.72 (2H, m), 4.20-4.34 (3.8H, s), 4.57 (1H, t, J = 5.2 Hz), 6.03 (0.1H, s), 7.76 (0.1H, s), 7.88-7.95 (2H, m), 8.10-8.17 (2.9H, m), 11.89-11.94 (0.1H, br). MS (ESI) m/z: 495 [M + Na]⁺ Ex. 106

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.31 (1.8H, s), 4.65 (1.8H, s), 4.72 (0.2H, s), 6.04 (0.1H, s), 7.76 (0.1H, s), 7.88-7.95 (2H, m), 8.10-8.19 (2.9H, m). MS (ESI) m/z: 341 [M − H]⁻ Ex. 107

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.84- 2.93 (2H, m), 2.98-3.09 (2H, m), 4.49 (1.8H, s), 6.19 (0.1H, s), 7.10-7.22 (2H, m), 7.29-7.37 (2H, m), 7.81 (0.1H, s), 7.87-7.98 (5H, m), 8.11-8.19 (2H, m), 8.23 (1H, s). MS (ESI) m/z: 404 [M + H]⁺ Ex. 108

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.04- 3.18 (2H, m), 3.38-3.48 (4H, m), 3.72-3.84 (2H, m), 3.87-3.99 (2H, m), 4.30 (1.8H, s), 4.45-4.51 (1.8H, m), 4.57-4.64 (0.2H, m), 6.01 (0.1H, s), 7.70 (0.1H, s), 7.88-7.96 (2H, m), 8.10-8.18 (2H, m), 8.20 (0.9H, s), 10.80-11.05 (1H, br). MS (ESI) m/z :398 [M + H]⁺ Ex. 109

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.85- 2.07 (3H, m), 2.22-2.34 (1H, m), 3.15-3.26 (2H, m), 4.36 (1.8H, s), 4.42-4.52 (1H, m), 5.80-5.97 (2H, m), 5.98 (0.1H, s), 7.80 (0.1H, s), 7.88-7.97 (2H, m), 8.08-8.23 (2.9H, m), 8.80-9.40 (1H, br), 9.70-10.50 (1H, br). MS (ESI) m/z: 412 [M + H]⁺ Ex. 110

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.76- 3.85 (1H, m), 4.05-4.20 (4H, m), 4.34 (1.8H, s), 5.82 (1.6H, s), 5.90 (0.4H, s), 5.97 (0.1H, s), 7.78 (0.1H, s), 7.88-7.97 (2H, m), 8.10-8.20 (2.9H, m), 8.70-8.90 (2H, br). MS (ESI) m/z: 398 [M + H]⁺ Ex. 111

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.25- 3.72 (7H, m), 4.20-4.27 (3.8H, m), 4.44 (1H, t, J = 5.6 Hz), 4.61 (1H, d, J = 4.9 Hz), 6.00 (0.1H, s), 7.74 (0.1H, s), 7.88-7.97 (2H, m), 8.10-8.18 (2.9H, m), 11.85-11.95 (0.1H, br). MS (ESI) m/z: 425 [M + Na]⁺ Ex. 112

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.25- 3.48 (5H, m), 3.68-3.77 (1.8H, m), 3.78-3.83 (0.2H, m), 4.17-4.26 (3.6H, m), 4.27-4.32 (0.2H, m), 4.47 (2H, t, J = 5.4 Hz), 5.96 (0.1H, s), 7.70 (0.1H, s), 7.87-7.97 (2H, m), 8.10-8.18 (2.9H, m). MS (ESI) m/z: 425 [M + Na]⁺ Ex. 113

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.36 (1.8H, s), 5.30 (1.8H, s), 5.40 (0.2H, s), 6.12 (0.1H, s), 7.41- 7.62 (2H, m), 7.76 (0.1H, s), 7.89- 7.99 (3H, m), 8.11-8.21 (2.9H, m), 8.58-8.65 (1H, m). MS (ESI) m/z: 398 [M + Na]⁺ Ex. 114

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.11- 1.18 (6H, m), 3.38-3.51 (1H, m), 4.07-4.25 (2H, m), 4.30 (1.8H, s), 4.36-4.50 (2H, m), 5.12-5.31 (1H, br), 5.99 (0.1H, s), 7.79 (0.1H, s), 7.87-7.97 (2H, m), 8.08-8.21 (2.9H, m), 10.80-11.25 (1H, br). MS (ESI) m/z: 382 [M + H]⁺ Ex. 115

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.93- 3.22 (4H, m), 3.62-4.08 (4H, m), 4.10-4.27 (2H, br), 4.32 (1.8H, s), 4.93 (1.8H, m), 5.02 (0.2H, m), 6.02 (0.1H, s), 7.78 (0.1H, s), 7.89-7.97 (2H, m), 8.10-8.21 (2.9H, m), 11.15-11.80 (1H, br). MS (ESI) m/z: 422 [M + H]⁺ Ex. 116

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.87- 2.07 (4H, m), 2.97-3.57 (4H, m), 4.19-4.27 (2H, m), 4.32 (1.8H, s), 4.92 (1.8H, m), 5.00 (0.2H, m), 6.02 (0.1H, s), 7.79 (0.1H, s), 7.90-7.99 (2H, m), 8.11-8.23 (2.9H, m), 10.96-11.42 (1H, br). MS (ESI) m/z: 406 [M + H]⁺ Ex. 117

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.33 (1.8H, s), 5.51 (1.8H, s), 5.59 (0.2H, s), 6.06 (0.1H, s), 7.76 (0.1H, s), 7.89-7.96 (2H, m), 8.10- 8.19 (2.9H, m). MS (ESI) m/z: 365 [M − H]⁻ Ex. 118

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.26 (1.8H, s), 5.26 (1.8H, 3), 5.36 (0.2H, s), 6.02 (0.1H, s), 7.75 (0.1H, s), 7.88-7.95 (2.9H, m), 7.98 (0.1H, s), 8.10-8.18 (2.9H, m). MS (ESI) m/z: 366 [M + H]⁺ Ex. 119

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.69- 1.82 (2H, m), 3.40-3.53 (2H, m), 4.14-4.17 (1.8H, m), 4.20 (1.8H, s), 4.25-4.28 (0.2H, m), 4.51 (1H, t, J = 5.1 Hz), 5.98 (0.1H, s), 7.72 (0.1H, s), 7.88-7.98 (2H, m), 8.10- 8-19 (2.9H, m). MS (ESI) m/z: 365 [M + Na]⁺ Ex. 120

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.93- 1.01 (6H, m), 1.93-2.07 (2H, m), 2.10-2.26 (1H, m), 3.84-3.94 (1H, m), 4.19-4.31 (5.8H, m), 6.01 (0.1H, s), 7.74 (0.1H, s), 7.90- 7.98 (2H, m), 8.12-8.20 (2.9H, m), 8.38-8.63 (3H, m). MS (ESI) m/z: 442 [M + H]⁺ Ex. 121

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.95- 4.13 (2H, m), 4.26-4.35 (3.8H, m), 5.25-5.38 (1H, m), 5.99 (0.1H, s), 7.78 (0.1H, s), 7.88-7.99 (2H, m), 8.10-8.23 (2.9H, m), 8.70-9.30 (2H, br). MS (ESI) m/z: 340 [M + H]⁺ Ex. 122

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.46- 3.62 (2H, m), 4.00-4.12 (1H, m), 4.21-4.43 (5.8H, m), 4.80 (1H, t, J = 5.9 Hz), 5.37 (0.9H, d, J = 6.1 Hz), 5.44 (0.1H, d, J = 6.1 Hz), 6.00 (0.1H, s), 7.75 (0.1H, s), 7.88- 7.97 (2H, m), 8.10-8.18 (2.9H, m). MS (ESI) m/z: 439 [M + Na]⁺ Ex. 123

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.22- 1.42 (2H, m), 1.53-1.62 (2H, m), 1.68-1.78 (2H, m), 2.87 (2H, t, J = 7.6Hz), 3.48-3.69 (3H, m), 3.83- 3.98 (2H, m), 4.03 (1H, dd, J = 11.5, 3.7 Hz), 6.79-6.84 (1H, m), 7.51- 7.60 (2H, m), 7.68-7.80 (2.0H). MS (ESI) m/z: 357 [M − H]⁻, 381 [M + Na]⁺ Ex. 124

¹H-NMR (DMSO-d₆, 400 MHz) δ: 5.00 (2H, s), 5.12 (1H, s), 7.07 (1H, s), 7.65 (1H, s), 7.80-7.90 (2H, m), 8.10-8.18 (2H, m). MS (ESI) m/z: 388 [M + Na]⁺ Ex. 125

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.82 (2H, t, J = 5.5 Hz), 3.46-3.66 (8H, m), 3.96-4.04 (2H, m), 4.17-4.32 (1H, br), 5.07 (1H, s), 7.06 (1H, s), 7.81-7.95 (2H, m), 8.04-8.20 (2H, m). MS (ESI) m/z: 395 [M + Na]⁺ Ex. 126

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.75- 1.89 (1H, m), 2.82 (2H, t, J = 5.4 Hz), 3.41-3.48 (4H, m), 3.55 (2H, t, J = 5.4 Hz), 3.86-4.20 (2H, m), 5.02 (1H, s), 7.05 (1H, s), 7.80-7.92 (2H, m), 8.05-8.15 (2H, m). MS (ESI) m/z: 395 [M + Na]⁺ Ex. 127

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.96, 0.98 (total 9H, s, s), 3.15, 3.18 (total 2H, s, s), 4.15-4.70 (4H, m), 4.30 (1.8H, s), 5.15-5.35 (1H, m), 5.98 (0.1H, s), 7.80 (0.1H, s), 7.88-7.95 (2H, m), 8.10-8.17 (2H, m), 8.20 (0.9H, s), 10.15-10.40 (1H, br). MS (ESI) m/z: 410 [M + H]⁺ Ex. 128

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.84 (2H, t, J = 5.4Hz), 3.10-4.10 (11H, m), 5.08 (1H, s), 7.07 (1H, s), 7.82-8.00 (2H, m), 8.05-8.25 (2H, m). MS (ESI) m/z: 425 [M + Na]⁺ Ex. 129

¹H-NMR (D₂O, 400 MHz) δ: 2.97 (2H, t, J = 4.9 Hz), 3.40-3.60 (4H, m), 3.63-3.75 (4H, m), 3.76-3.85 (1H, m), 4.03-4.13 (2H, m), 4.22-4.30 (0.2H, s), 6.75 (1H, s), 7.45-7.57 (2H, m), 7.60-7.71 (2H, m) MS (ESI) m/z: 425 [M + Na]⁺ Ex. 130

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.23- 1.34 (6H, m), 2.00-2.45 (2H, m), 3.05-3.28 (2H, m), 3.37-3.62 (2.7H, m), 3.70-3.87 (0.3H, m), 4.25 (1.8H, s), 5.33-5.47 (1H, m), 5.95 (0.1H, s), 7.73 (0.1H, s), 7.88-7.97 (2H, m), 8.10-8.24 (2.9H, m), 10.62-11.24 (1H, br) MS (ESI) m/z: 396 [M + H]⁺ Ex. 131

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.13- 3.22 (2H, m), 3.80-3.93 (1H, m), 4.09-4.19 (1H, m), 4.19-4.27 (1H, m), 4.30 (1.8H, s), 4.46-4.56 (1H, m), 5.19-5.35 (1H, m), 6.03 (0.1H, s), 7.74 (0.1H, s), 7.87- 7.96 (2H, m), 8.09-8.18 (2.9H, m), 11.19-13.19 (1H, br). MS (ESI) m/z: 424 [M − H]⁻ Ex. 132

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.75 (3H, s), 3.11-3.24 (2H, m), 3.60- 3.84 (7H, m), 3.97-4.18 (4H, m), 6.84-6.87 (1H, m), 7.60-7.66 (2H, m), 7.73-7.80 (2H, m). MS (ESI) m/z: 381 [M + Na]⁺ Ex. 133

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.65- 1.78 (2H, m), 2.81 (2H, t, J = 5.4 Hz), 3.49-3.58 (4H, m), 3.91-3.99 (2H, m), 4.09-4.30 (1H, br), 5.05 (1H, s), 7.06 (1H, s), 7.81-7.97 (2H, m), 8.03-8.22 (2H, m). MS (ESI) m/z: 365 [M + Na]⁺ Ex. 134

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.66- 2.77 (2H, m), 2.97-3.09 (2H, m), 4.25-4.32 (3.8H, m), 4.34-4.38 (2H, m), 6.01 (0.1H, s), 7.76 (0.1H, s), 7.85-8.05 (5H, m), 8.10-8.19 (2.9H, m). MS (ESI) m/z: 400 [M + H]⁺ Ex. 135

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.65- 2.77 (4H, m), 4.08 (1H, s), 4.33- 4.45 (4H, m), 6.08 (0.5H, s), 7.75 (0.5H, s), 7.75-7.85 (2H, m), 8.18-8.30 (2H, m), 11.65- 11.80 (0.5H, br). MS (ESI) m/z: 427 [M − H]⁻ Ex. 136

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.84 (2H, t, J = 5.4 Hz), 3.45-3.59 (16H, m), 3.96-4.03 (1.6H, br), 4.15-4.30 (0.4H, m), 5.09 (1H, s), 7.08 (1H, s), 7.82-7.91 (2H, m), 8.04-8.15 (2H, m). MS (ESI) m/z: 522 [M + H]⁺ Ex. 137

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.85 (2H, t, J = 5.4Hz), 3.14 (3H, s), 3.30-3.50 (2H, m), 3.57 (2H, t, J = 5.1Hz), 4.17-4.25 (2H, m), 5.01 (1H, s), 5.05-5.15 (1H, br), 7.07 (1H, s), 7.82-7.91 (2H, m), 8.04- 8.15 (2H, m). MS (ESI) m/z: 389 [M − H]⁻, 413 [M + Na]⁺ Ex. 138

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.39- 2.47 (2H, m), 3.57-3.69 (4H, m), 4.18-4.33 (3.8H, m), 6.03 (0.1H, s), 7.76 (0.1H, s), 7.88-7.97 (2H, m), 8.09-8.20 (2.9H, m), 11.86- 11.95 (0.1H, br), 12.03-12.36 (1H, br). MS (ESI) m/z: 399 [M − H]⁻ Ex. 139

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.20 (6H, t, J = 7.3Hz), 3.05-3.18 (4H, m), 3.21-3.27 (2H, m), 3.65-3.83 (4H, m), 4.22-4.35 (3.8H, m), 6.00 (0.1H, s), 7.76 (0.1H, s), 7.88- 7.98 (2H, m), 8.11-8.19 (2.9H, m), 9.70-10.05 (1H, br) MS (ESI) m/z: 426 [M − H]⁻, 428 [M + H]⁺ Ex. 140

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.85 (2H, t, J = 5.4Hz), 3.36-3.43 (2H, m), 3.52 (2H, t, J = 4.9 Hz), 3.56 (2H, t, J = 5.4Hz), 3.83 (2H, t, J = 4.9Hz), 4.24 (2H, t, J = 4.9 Hz), 4.96 (1H, s), 5.00-5.15 (1H, br), 7.08 (1H, s), 7.83-7.89 (2H, m), 8.07-8.11 (2H, m). MS (ESI) m/z: 443 [M + Na]⁺ Ex. 141

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.20- 3.30 (2H, m), 3.50-3.63 (2H, m), 3.70 (1.8H, t, J = 5.6 Hz), 3.77 (0.2H, t, J = 5.6Hz), 4.32 (1.8H, s), 4.48 (1.8H, t, J = 5.6 Hz), 4.56 (0.2H, t, J = 5.6 Hz), 6.08 (0.1H, s), 7.79 (0.1H, s), 7.89-7.98 (2H, m), 8.08-8.25 (5.9H, m). MS (ESI) m/z: 418 [M − H]⁻, 420 [M + H]⁺ Ex. 142

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.04- 3.21 (2H, m), 4.24-4.38 (6.8H, m), 5.93 (0.1H, s), 7.19-7.34 (5H, m), 7.74 (0.1H, s), 7.91- 7.95 (2H, m), 8.11-8.17 (2.9H, m), 8.40-8.70 (3H, br). MS (ESI) m/z: 476 [M + H]⁺ Ex. 143

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.52- 2.57 (2H, m), 3.19-3.23 (3H, m), 3.57-3.70 (4H, m), 4.18-4.33 (3.8H, m), 6.02 (0.1H, s), 7.75 (0.1H, s), 7.89-7.96 (2H, m), 8.10-8.17 (2.9H, m), 11.63-11.82 (1H, br). MS (ESI) m/z: 500 [M + Na]⁺ Ex. 144

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.87- 1.02 (6H, m), 2.00-2.15 (1H, m), 2.92, 2.97, 3.08, 3.14 (total 3H, s, s, s, s), 3.38-3.45 (2H, m), 3.77-3.90 (1H, m), 4.15-4.30 (4H, m), 5.93, 6.14 (total 0.1 H, s, s), 7.72, 7.78 (total 0.1H, s, s), 7.88-7.99 (2H, m), 8.06-8.20 (6H, m). MS (ESI) m/z: 441 [M + H]⁺ Ex. 145

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.13 (6H, s), 3.18, 3.22 (total 3H, s, s), 4.18-4.30 (3.8H, m), 5.99 (0.1H, s), 7.75 (0.1H, s), 7.88- 7.98 (2H, m), 8.12-8.20 (2.9H, m), 11.38-11.55 (1H, br). MS (ESI) m/z: 484 [M + Na]⁺ Ex. 146

¹H-NMR (DMSO-d₆, 400 MHz) δ: 4.30 (1.8H, s), 4.48-4.61 (2H, m), 4.78-4.87 (2H, m), 5.43-5.54 (1H, m), 6.06 (0.1H, s), 7.77 (0.1H, s), 7.88-7.98 (2H, m), 8.10-8.18 (2.9H, m). MS (ESI) m/z: 363 [M + Na]⁺ Ex. 147

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.10 (2.7H, t, J = 7.1 Hz), 1.17 (0.3H, t, J = 7.1Hz), 3.15-3.25 (2H, m), 4.00-4.27 (2H, br), 4.31 (1.8H, s), 4.31-4.53 (2H, br), 5.12-5.45 (1H, br), 5.99 (0.1H, s), 7.79 (0.1H, s), 7.87-7.98 (2H, m), 8.08-8.21 (2.9H, m), 10.70-11.25 (1H, br). MS (ESI) m/z: 366 [M − H]⁻, 368 [M + H]⁺ Ex. 148

¹H-NMR (DMSO-d₆, 400 MHz) δ: 3.29 (3H, s), 4.34 (1.8H, s), 5.26 (1.8H, s), 5.34 (0.2H, s), 6.05-6.15 (0.1H, br), 7.44-7.56 (2H, m), 7.69-7.77 (0.1H, br), 7.88-7.98 (4H, m), 8.09- 8.19 (2.9H, m), 11.86-12.40 (1H, br). MS (ESI) m/z: 518 [M + Na]⁺ Ex. 149

¹H-NMR (DMSO-d₆, 400 MHz) δ: 2.80- 2.95 (2H, m), 4.23 (1.8H, s), 4.29- 4.49 (5H, m), 5.96 (0.1H, s), 7.73 (0.1H, s), 7.89-7.98 (2H, m), 8.09- 8.19 (2.9H, m), 8.27-8.50 (3H, br). MS (ESI) m/z: 444 [M + H]⁺ Ex. 150

¹H-NMR (DMSO-d₆, 400 MHz) δ: 0.89 (6H, d, J = 6.4Hz), 1.56-1.82 (3H, m), 3.92-4.01 (1H, m), 4.25 (1.8H, s), 4.32-4.55 (4H, m), 5.96 (0.1H, s), 7.75 (0.1H, s), 7.88-7.98 (2H, m), 8.10-8.22 (2.9H, m), 8.43-8.65 (3H, br). MS (ESI) m/z: 442 [M + H]⁺ Ex. 151

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.99- 2.13 (5H, m), 2.53-2.70 (2H, m), 4.06-4.18 (1H, m), 4.26 (1.8H, s), 4.31-4.52 (4H, m), 5.97 (0.1H, s), 7.74 (0.1H, s), 7.87-7.99 (2H, m), 8.08-8.20 (2.9H, s), 8.55-8.75 (3H, br). MS (ESI) m/z: 460 [M + H]⁺ Ex. 152

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.85- 2.09 (2H, m), 2.48-2.55 (2H, m), 3.53-3.59 (1H, m), 4.20-4.38 (6H, m), 7.88-7.96 (2H, m), 8.07-8.23 (3H). MS (ESI) m/z: 458 [M + H]⁺ Ex. 153

¹H-NMR (DMS)-d₆, 400 MHz) δ: 1.37- 1.44 (3H, m), 1.93-2.06 (2H, m), 4.03-4.14 (1H, m), 4.17-4.31 (5.8H, m), 6.02 (0.1H, s), 7.75 (0.1H, s), 7.91-7.95 (2H, m), 8.11-8.17 (2.9H, m), 8.40-8.60 (3H, br). MS (ESI) m/z: 414 [M + H]⁺ Ex. 154

¹H-NMR (DMSO-d₆, 400 MHz) δ: 1.91- 2.08 (2H, m), 3.74-3.92 (2H, m), 4.11-4.33 (6.8H, m), 5.55-5.63 (1H, m), 6.02 (0.1H, s), 7.75 (0.1H, s), 7.89-7.96 (2H, m), 8.10-8.18 (2.9H, m), 8.33-8.56 (3H, br). MS (ESI) m/z: 430 [M + H]⁺

Experimental Example 1: Plasma Concentration After Oral Administration to Rat

Compound (A) or Example compound suspended in 0.5% methylcellulose solution was administered by gavage to male SD rats at a dose of 30 mg/kg or 100 mg/kg, respectively. At 0.25, 0.5, 1, 3, 5, 8 and 24 hr after administration, blood samples were collected from the cervical vein with a 1 mL syringe to which heparin was added. Using HPLC, the plasma concentration of compound (A) was determined.

After administration of the compound of Example 1-4, 6-9, 11, 12, 15-19, 22, 25, 26, 30-33, 35, 37-42, 48-53, 55-57, 60-64, 67, 68, 70, 72-75, 83, 85 or 86, compound (A) emerged in the plasma over time. The maximum plasma concentration of compound (A) at the time was markedly higher than that by the administration of compound (A) itself.

Experimental Example 2: Blood Concentration After Oral Administration to Rat or Dog

Compound (A) or Example compound suspended in 0.5% methylcellulose solution was administered by gavage to male SD rat or male beagle at a dose of 30 mg/kg or 100 mg/kg, respectively. At 0.25, 0.5, 1, 2, 4, 6 and 24 hr after administration, blood samples were collected from the cervical vein with a 1 mL syringe and was added in a 2.0 mL tube to which heparin was added. The blood was treated with acetonitrile, and the blood concentration of compound (A) was determined by using HPLC or LC-MS/MS.

After administration of the compound of Example 13, 54, 60, 65, 66, 74, 75, 79, 88, 93, 95, 114, 116, 120, 125, 126, 129 or 133, compound (A) emerged in the blood over time. The maximum blood concentration of compound (A) at the time was higher than that by the administration of compound (A) itself.

Experimental Example 3: Metabolism by Plasma and Liver Microsome

Hydrolysis by plasma: The plasma (495 μL) of human or SD rat was added in a 1.5 mL plastic tube, 100 μg/mL test compound solution (5 μL) was added thereto in a warm bath at 37° C. After 15, 30 and 60 min, the reaction mixture was collected by 50 μL, acetonitrile (50 μL) was added and mixed, and the mixture was centrifuged at 12,000×g, 4° C. for 3 min. The concentration of compound (A) in the supernatant was measured by HPLC.

Hydrolysis by liver microsome: 0.5 M Phosphate buffer (100 μL), NADPH regeneration system solution A (25 μL), NADPH regeneration system solution B (5 μL), ultra-pure water (353 μL) and 100 μg/mL test compound solution (5 μL) were added in a 1.5 mL plastic tube, and 20 mg protein/mL human, beagle or SD rat liver microsome suspension (11.3 μL) was added thereto to start the reaction. After 15, 30 and 60 min, the reaction mixture was collected by 50 μL, acetonitrile (50 μL) was added thereto, respectively, and mixed, and the mixture was centrifuged at 12,000×g, 4° C. for 3 min. The concentration of compound (A) in the supernatant was measured by HPLC.

The compounds of Examples 1-5, 8, 9, 12, 15, 19, 22, 23, 30, 60, 61, 69, 72-75, 93, 95-98, 105, 108, 111, 112, 114, 118-120, 134, 136, 137, 140, 141, 146 and 147 were rapidly converted to compound (A) by the plasma and liver microsome of rat. In addition, they were gradually converted to compound (A) in human plasma, and markedly and rapidly converted to compound (A) in human or beagle liver microsome.

INDUSTRIAL APPLICABILITY

The compound of the present invention or a pharmaceutically acceptable salt thereof is effective as a prodrug of a naphthofuran compound useful as an anticancer agent, or an agent for the prophylaxis or treatment of cancer metastasis and/or cancer recurrence. In addition, a medicament containing the compound of the present invention shows high oral absorbability and less side effects, and therefore, it can be a highly safe therapeutic agent for cancer or an agent for the prophylaxis or treatment of cancer metastasis and/or cancer recurrence.

The present invention is based on patent application Nos. 2014-119113 and 2015-021492 filed in Japan, the contents of which are incorporated in full herein. 

The invention claimed is:
 1. A compound represented by the formula (IA):

wherein R¹ in the number of n are each independently hydrogen, halogen, C₁₋₆ alkoxy, or two R¹ bonded to the adjacent carbon atoms on a benzene ring are optionally joined to form C₁₋₄ alkylenedioxy, R² is C₁₋₁₂ alkyl optionally substituted by one or two substituent(s) selected from substituent group α, C₂₋₆ alkynyl optionally substituted by one or two substituent(s) selected from optionally substituted amino and optionally substituted monocyclic heterocyclyl group, C₃₋₇ cycloalkyl, phenyl, phenyl C₁₋₆ alkyl, or monocyclic heterocyclyl group, R³ is hydrogen, n is an integer of 1-4 when R¹ is hydrogen, n is 1 or 2 when R¹ is not hydrogen, and the substituent group α consists of hydroxy, optionally substituted amino, carboxy, C₁₋₆ alkoxycarbonyl, sulfo group, di C₁₋₆ alkyl phosphoric acid group, optionally substituted C₁₋₆ alkyl, C₃₋₇ cycloalkyl, C₃₋₇ cycloalkyl C₁₋₆ alkyl, optionally substituted C₁₋₆ alkoxy, optionally substituted phenyl, optionally substituted phenyloxy, phenyl C₁₋₆ alkoxy, optionally substituted monocyclic heterocyclyl group, optionally substituted C₁₋₆ alkylcarbonyl, monocyclic heterocyclylcarbonyl, optionally substituted C₁₋₆ alkylcarbonyloxy, optionally substituted C₃₋₇ cycloalkylcarbonyloxy, phenylcarbonyloxy, monocyclic heterocyclylcarbonyloxy, optionally substituted C₁₋₆ alkoxycarbonyloxy, optionally substituted monocyclic heterocyclyl C₁₋₆ alkoxycarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy, monocyclic heterocyclyloxycarbonyloxy, optionally substituted monocyclic heterocyclyloxy, tri C₁₋₆ alkylammonio, optionally substituted C₁₋₆ alkylsulfonyl and C₁₋₆ alkylsulfamoylcarbonyl, or a pharmaceutically acceptable salt thereof.
 2. A compound represented by the formula (I):

wherein R¹ is hydrogen or halogen, R² is C₁₋₁₂ alkyl optionally substituted by one or two substituent(s) selected from substituent group α, C₂₋₆ alkynyl optionally substituted by one or two substituent(s) selected from optionally substituted amino and optionally substituted monocyclic heterocyclyl group, C₃₋₇ cycloalkyl, phenyl phenyl C₁₋₆ alkyl, or monocyclic heterocyclyl group, n is an integer of 1-4 when R¹ is hydrogen, n is 1 or 2 when R¹ is not hydrogen, and the substituent group α consists of hydroxy, optionally substituted amino, carboxy, C₁₋₆ alkoxycarbonyl, sulfo group, di C₁₋₆ alkyl phosphoric acid group, optionally substituted C₁₋₆ alkyl, C₃₋₇ cycloalkyl, C₃₋₇ cycloalkyl C₁₋₆ alkyl, optionally substituted C₁₋₆ alkoxy, optionally substituted phenyl, optionally substituted phenyloxy, phenyl C₁₋₆ alkoxy, optionally substituted monocyclic heterocyclyl group, optionally substituted C₁₋₆ alkylcarbonyl, monocyclic heterocyclylcarbonyl, optionally substituted C₁₋₆ alkylcarbonyloxy, optionally substituted C₃₋₇ cycloalkylcarbonyloxy, phenylcarbonyloxy, monocyclic heterocyclylcarbonyloxy, optionally substituted C₁₋₆ alkoxycarbonyloxy, optionally substituted monocyclic heterocyclyl C₁₋₆ alkoxycarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy, monocyclic heterocyclyloxycarbonyloxy, optionally substituted monocyclic heterocyclyloxy, tri C₁₋₆ alkylammonio, optionally substituted C₁₋₆ alkylsulfonyl and C₁₋₆ alkylsulfamoylcarbonyl, or a pharmaceutically acceptable salt thereof.
 3. The compound according to claim 1, wherein the substituent group α consists of hydroxy, optionally substituted amino, carboxy, C₁₋₆ alkoxycarbonyl, sulfo group, di C₁₋₆ alkyl phosphoric acid group, C₁₋₆ alkyl, C₃₋₇ cycloalkyl, C₁₋₆ alkoxy, optionally substituted phenyl, optionally substituted phenyloxy, phenyl C₁₋₆ alkoxy, optionally substituted monocyclic heterocyclyl group, optionally substituted C₁₋₆ alkylcarbonyl, monocyclic heterocyclylcarbonyl, optionally substituted C₁₋₆ alkylcarbonyloxy, optionally substituted C₃₋₇ cycloalkylcarbonyloxy, monocyclic heterocyclylcarbonyloxy, optionally substituted C₁₋₆ alkoxycarbonyloxy, optionally substituted monocyclic heterocyclyl C₁₋₆ alkoxycarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy, monocyclic heterocyclyloxycarbonyloxy, optionally substituted monocyclic heterocyclyloxy and tri C₁₋₆ alkylammonio, or a pharmaceutically acceptable salt thereof.
 4. The compound according to claim 2, wherein the substituent group α consists of hydroxy, optionally substituted amino, carboxy, C₁₋₆ alkoxycarbonyl, sulfo group, di C₁₋₆ alkyl phosphoric acid group, C₁₋₆ alkyl, C₃₋₇ cycloalkyl, C₁₋₆ alkoxy, optionally substituted phenyl, optionally substituted phenyloxy, phenyl C₁₋₆ alkoxy, optionally substituted monocyclic heterocyclyl group, optionally substituted C₁₋₆ alkylcarbonyl, monocyclic heterocyclylcarbonyl, optionally substituted C₁₋₆ alkylcarbonyloxy, optionally substituted C₃₋₇ cycloalkylcarbonyloxy, monocyclic heterocyclylcarbonyloxy, optionally substituted C₁₋₆ alkoxycarbonyloxy, optionally substituted monocyclic heterocyclyl C₁₋₆ alkoxycarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy, monocyclic heterocyclyloxycarbonyloxy, optionally substituted monocyclic heterocyclyloxy and tri C₁₋₆ alkylammonio, or a pharmaceutically acceptable salt thereof.
 5. The compound according to claim 2, wherein R² is C₁₋₆ alkyl optionally substituted by one or two substituent(s) selected from substituent group α, C₃₋₇ cycloalkyl, phenyl, phenyl C₁₋₆ alkyl, or monocyclic heterocyclyl group, and the substituent group α consists of hydroxy, optionally substituted amino, carboxy, sulfo group, C₁₋₆ alkyl, C₃₋₇ cycloalkyl, C₁₋₆ alkoxy, phenyl and monocyclic heterocyclyl group, or a pharmaceutically acceptable salt thereof.
 6. The compound according to claim 2, wherein R² is (1) C₁₋₆ alkyl optionally substituted by one or two substituent(s) selected from hydroxy, optionally substituted amino, carboxy, sulfo group, di C₁₋₆ alkyl phosphoric acid group, monocyclic heterocyclyl group, optionally substituted C₁₋₆ alkoxy, optionally substituted C₁₋₆ alkylcarbonyloxy, monocyclic heterocyclylcarbonyloxy, C₃₋₇ cycloalkyloxycarbonyloxy and monocyclic heterocyclyloxycarbonyloxy; (2) C₂₋₆ alkynyl optionally substituted by one or two substituent(s) selected from optionally substituted amino and monocyclic heterocyclyl group; (3) monocyclic heterocyclyl group; or (4) phenyl C₁₋₆ alkyl, or a pharmaceutically acceptable salt thereof.
 7. The compound according to claim 2, wherein R² is (1) C₁₋₆ alkyl optionally substituted by one or two substituent(s) selected from hydroxy, optionally substituted C₁₋₆ alkoxy, optionally substituted C₁₋₆ alkylcarbonyloxy and monocyclic heterocyclylcarbonyloxy; or (2) C₂₋₆ alkynyl optionally substituted by one or two substituent(s) selected from optionally substituted amino and monocyclic heterocyclyl group; or (3) monocyclic heterocyclyl group, or a pharmaceutically acceptable salt thereof.
 8. The compound according to any one of claims 1 to 7, wherein R¹ is hydrogen, or a pharmaceutically acceptable salt thereof.
 9. A pharmaceutical composition comprising a compound according to claim 8 or a pharmaceutically acceptable salt thereof as an active ingredient.
 10. A compound, which is

or a pharmaceutically acceptable salt thereof.
 11. A compound, which is

or a pharmaceutically acceptable salt thereof.
 12. The compound according to claim 2, which is


13. A pharmaceutical composition comprising a compound according to any one of claims 1 to 7, 10, and 11 or a pharmaceutically acceptable salt thereof as an active ingredient.
 14. A pharmaceutical composition comprising a compound according to claim 12 as an active ingredient.
 15. A method of treating cancer, cancer metastasis, and/or cancer recurrence in a human subject in need thereof comprising administering to the subject a therapeutically effective amount of a compound according to any one of claims 1 to 7 and 10 to 12 or a pharmaceutically acceptable salt thereof.
 16. The method according to claim 15, wherein the cancer is selected from the group consisting of breast cancer, head and neck cancer, lung cancer, ovarian cancer, pancreatic cancer, colorectal cancer, prostate cancer, esophageal cancer, nasopharyngeal cancer, pituitary cancer, gallbladder cancer, thyroid cancer, salivary gland cancer, urinary bladder cancer, renal cell carcinoma, melanoma, hepatoma, cervical cancer, endometrial carcinoma, Kaposi's sarcoma, Ewing's sarcoma, medulloblastoma, sarcoma, brain tumor, gastric cancer, multiple myeloma, leukemia, and lymphoma.
 17. A method of treating cancer, cancer metastasis, and/or cancer recurrence in a human subject in need thereof comprising administering to the subject a therapeutically effective amount of a compound according to claim 8 or a pharmaceutically acceptable salt thereof.
 18. The method according to claim 17, wherein the cancer is selected from the group consisting of breast cancer, head and neck cancer, lung cancer, ovarian cancer, pancreatic cancer, colorectal cancer, prostate cancer, esophageal cancer, nasopharyngeal cancer, pituitary cancer, gallbladder cancer, thyroid cancer, salivary gland cancer, urinary bladder cancer, renal cell carcinoma, melanoma, hepatoma, cervical cancer, endometrial carcinoma, Kaposi's sarcoma, Ewing's sarcoma, medulloblastoma, sarcoma, brain tumor, gastric cancer, multiple myeloma, leukemia, and lymphoma. 